[Feature Request] - internal event bus improvements (websocket)

[allburov]

Prepare internal event bus architecture for those features:

• [ ] Change webhook configuration per session (without restart) #203
• [ ] websocket conneciton
• [ ] socket.io connection

[devlikepro]

Will add first session.status event in 2024.6.7

[devlikepro]

# Listen all sessions and events
websocat ws://localhost:3000/api/ws
# The same as above
websocat ws://localhost:3000/api/ws?session=*&events=*

# Listen certain events
# (!) Only 'session.status' event is supported now
websocat ws://localhost:3000/api/ws?session=*&events=session.status

# Listen certain session
# NOT SUPPORTED YET
# websocat ws://localhost:3000/api/ws?session=default&events=session.status