Replace the `wss-proxy` Python plugin with its Rust equivalent

[ShahanaFarooqui]

After the replacement of the Python clnrest plugin with Rust, only one Python plugin remains in the repository: wss-proxy.

Migrating wss-proxy to Rust also would be beneficial for:

• Simplifying the installation process

• Enabling a Python-free Docker image creation

• Ensuring compatibility with NixOS

[daywalker90]

Hey @ShahanaFarooqui, i have an early build working that passes the test in test_connection.py::test_wss_proxy. Is there anything else i can test this against? When multiple protocols like tls and websocket with different versions are invovled there can be problems so i want to make sure it's compatible.

[ShahanaFarooqui]

The wss-proxy plugin is relatively new, and we initially kept it lightweight, adding only a basic connection test at the time. But please feel free to add more tests as you see fit or we can expand the test coverage as the plugin matures.