test(s2n-quic-core): add location to state transitions

[camshaft]

Description of changes:

This change adds the caller location to state transitions to make it easier to debug what line of code caused the transition to occur.

Testing:

Before

client:worker::write: s2n_quic_core::stream::state::send: event=on_send_stream prev=Ready next=Send client=0
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_cooldown_elapsed prev=Cooldown next=PeekPacket client=0
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_progress prev=EpochTimeout next=Cooldown
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_progress prev=PeekPacket next=Cooldown client=0
server:udp:worker::write: s2n_quic_core::stream::state::send: event=on_send_stream prev=Ready next=Send
server:udp:worker::write: s2n_quic_core::stream::state::send: event=on_send_fin prev=Send next=DataSent
server:udp:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_application_detach prev=Acking next=Detached
server:udp:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_shutdown prev=Detached next=ShuttingDown
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_cooldown_elapsed prev=Cooldown next=PeekPacket
client:worker::write: s2n_quic_core::stream::state::send: event=on_send_fin prev=Send next=DataSent client=0
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_peek_packet prev=PeekPacket next=EpochTimeout
client:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_application_detach prev=Acking next=Detached client=0
client:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_shutdown prev=Detached next=ShuttingDown client=0
server:stream: s2n_quic_core::stream::state::recv: event=on_receive_fin prev=Recv next=SizeKnown server=0 stream=0
server:stream: s2n_quic_core::stream::state::recv: event=on_receive_all_data prev=SizeKnown next=DataRecvd server=0 stream=0
server:stream: s2n_quic_core::stream::state::recv: event=on_app_read_all_data prev=DataRecvd next=DataRead server=0 stream=0
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_detach prev=EpochTimeout next=Detached
client:worker::write: s2n_quic_core::stream::state::send: event=on_recv_all_acks prev=DataSent next=DataRecvd client=0
client:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_finished prev=ShuttingDown next=Finished client=0
client: s2n_quic_core::stream::state::recv: event=on_receive_fin prev=Recv next=SizeKnown client=0
client: s2n_quic_core::stream::state::recv: event=on_receive_all_data prev=SizeKnown next=DataRecvd client=0
client: s2n_quic_core::stream::state::recv: event=on_app_read_all_data prev=DataRecvd next=DataRead client=0
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_detach prev=Cooldown next=Detached client=0
server:udp:worker::write: s2n_quic_core::stream::state::send: event=on_recv_all_acks prev=DataSent next=DataRecvd
server:udp:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_finished prev=ShuttingDown next=Finished

After

client:worker::write: s2n_quic_core::stream::state::send: event=on_send_stream prev=Ready next=Send location=dc/s2n-quic-dc/src/stream/send/state.rs:899:28 client=0
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_cooldown_elapsed prev=Cooldown next=PeekPacket location=dc/s2n-quic-dc/src/stream/recv/worker.rs:176:32 client=0
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_progress prev=EpochTimeout next=Cooldown location=dc/s2n-quic-dc/src/stream/recv/worker.rs:234:28
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_progress prev=PeekPacket next=Cooldown location=dc/s2n-quic-dc/src/stream/recv/worker.rs:234:28 client=0
server:udp:worker::write: s2n_quic_core::stream::state::send: event=on_send_stream prev=Ready next=Send location=dc/s2n-quic-dc/src/stream/send/state.rs:899:28
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_cooldown_elapsed prev=Cooldown next=PeekPacket location=dc/s2n-quic-dc/src/stream/recv/worker.rs:176:32
server:udp:worker::write: s2n_quic_core::stream::state::send: event=on_send_fin prev=Send next=DataSent location=dc/s2n-quic-dc/src/stream/send/state.rs:902:32
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_peek_packet prev=PeekPacket next=EpochTimeout location=dc/s2n-quic-dc/src/stream/recv/worker.rs:145:32
server:udp:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_application_detach prev=Acking next=Detached location=dc/s2n-quic-dc/src/stream/send/worker.rs:271:35
server:udp:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_shutdown prev=Detached next=ShuttingDown location=dc/s2n-quic-dc/src/stream/send/worker.rs:387:40
client:worker::write: s2n_quic_core::stream::state::send: event=on_send_fin prev=Send next=DataSent location=dc/s2n-quic-dc/src/stream/send/state.rs:902:32 client=0
client:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_application_detach prev=Acking next=Detached location=dc/s2n-quic-dc/src/stream/send/worker.rs:271:35 client=0
client:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_shutdown prev=Detached next=ShuttingDown location=dc/s2n-quic-dc/src/stream/send/worker.rs:387:40 client=0
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_progress prev=Cooldown next=Cooldown location=dc/s2n-quic-dc/src/stream/recv/worker.rs:234:28 client=0
server:stream: s2n_quic_core::stream::state::recv: event=on_receive_fin prev=Recv next=SizeKnown location=dc/s2n-quic-dc/src/stream/recv/state.rs:137:32 server=0 stream=0
server:stream: s2n_quic_core::stream::state::recv: event=on_receive_all_data prev=SizeKnown next=DataRecvd location=dc/s2n-quic-dc/src/stream/recv/state.rs:141:53 server=0 stream=0
server:stream: s2n_quic_core::stream::state::recv: event=on_app_read_all_data prev=DataRecvd next=DataRead location=dc/s2n-quic-dc/src/stream/recv/state.rs:146:48 server=0 stream=0
server:udp:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_detach prev=EpochTimeout next=Detached location=dc/s2n-quic-dc/src/stream/recv/worker.rs:217:32
client:worker::write: s2n_quic_core::stream::state::send: event=on_recv_all_acks prev=DataSent next=DataRecvd location=dc/s2n-quic-dc/src/stream/send/state.rs:424:27 client=0
client: s2n_quic_core::stream::state::recv: event=on_receive_fin prev=Recv next=SizeKnown location=dc/s2n-quic-dc/src/stream/recv/state.rs:137:32 client=0
client: s2n_quic_core::stream::state::recv: event=on_receive_all_data prev=SizeKnown next=DataRecvd location=dc/s2n-quic-dc/src/stream/recv/state.rs:141:53 client=0
client: s2n_quic_core::stream::state::recv: event=on_app_read_all_data prev=DataRecvd next=DataRead location=dc/s2n-quic-dc/src/stream/recv/state.rs:146:48 client=0
client:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_finished prev=ShuttingDown next=Finished location=dc/s2n-quic-dc/src/stream/send/worker.rs:403:44 client=0
client:worker::read: s2n_quic_dc::stream::recv::worker::waiting: event=on_application_detach prev=Cooldown next=Detached location=dc/s2n-quic-dc/src/stream/recv/worker.rs:217:32 client=0
server:udp:worker::write: s2n_quic_core::stream::state::send: event=on_recv_all_acks prev=DataSent next=DataRecvd location=dc/s2n-quic-dc/src/stream/send/state.rs:424:27
server:udp:worker::write: s2n_quic_dc::stream::send::worker::waiting: event=on_finished prev=ShuttingDown next=Finished location=dc/s2n-quic-dc/src/stream/send/worker.rs:403:44

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.