feat: add title mgt and protobuf for ipc

[imLinguin]

I want to kickoff the service work a little, I want to discuss the IPC aspect, and ideally start moving things to the new service crate

List

• init xodus-service tool
• decide on connection flow with sdk
• expose functionality for XUser
• expose functionality for XStore

[imLinguin]

I think it makes sense to use protobuf for internal communication between processes. As I also aim to make CLI mostly just a service caller, that would enable adding the dedicated GUI app.

I imagine two sets of connections, one dedicated to the xgameservices.dll that is the best for communication with it and one for communication with native apps - protobuf based socket may be the best.

[imLinguin]

Discussions from Discord: we decided to go with Unix socket

the packet would look like

magic: 4 bytes
message_size u16
message_type u16
message: String

message would be XML encoded

[imLinguin]

Initial XUser funcs landed, currently for XML transport only.
I'll expand protobuf transport when its time to move CLI functionality to service