Add OSCQuery-style live updates: same-port WebSocket + LISTEN/IGNORE

[egemenertugrul]

Summary

Adds OSCQuery-style live value updates by serving HTTP and WebSocket on the same port and supporting LISTEN/IGNORE with binary OSC over WebSocket, as in the OSCQuery proposal.

Changes

• Same port: When aiohttp is installed, HTTP and WebSocket run on the same port (HOST_INFO ws_port = HTTP port). Falls back to a separate WebSocket port if only websockets is available.
• LISTEN/IGNORE: WebSocket clients can send {"COMMAND": "LISTEN", "DATA": "/path"} (and IGNORE) to subscribe; the server streams binary OSC packets when update_value(path, value) is called (requires python-osc).
• HOST_INFO: Adds LISTEN and PATH_CHANGED to EXTENSIONS when using the combined server.
• Dependencies: Optional aiohttp for same-port server; existing optional python-osc and websockets unchanged.

Backward compatibility

• If aiohttp is not installed, behavior matches the previous implementation (separate WebSocket port, JSON push).
• No API changes for OSCQueryService constructor or update_value().

Tested

• With Chataigne