WebSocket API Support & Update CI to nightly system

[binn]

This PR bring support to VRChat's WebSocket API through a third package, VRChat.API.Realtime.

Here is the rundown:

• Support for every event type listed in https://vrchat.community/websocket
• Introduces IVRChatRealtime and VRChatRealtimeClientBuilder
• Same interfaces to build realtime clients as primary VRChat.API
• Does not share model classes with generated spec
• To alleviate the bug where Cloudflare stops sending data, there is an AutoReconnectMode enum with options for OnDisconnect, Every10Min, and Every20Min
• Also, to also try to alleviate the Cloudflare bug, the library sends a nonce'd heartbeat every 30 seconds to keep data flowing between the API and the client.
• In the future, this option will be toggleable
• Easy to build more events onto the existing system, just make the model class and add the event type to the switch in ProcessMessage
• Updated docs to include WebSocket info and WEBSOCKET.md for WebSocket specific docs.
• Created an example project in examples/ folder for WebSocket.
• Implemented XMLDoc for all types and properties, so if you're using a modern IDE, the library is self documented in your LSP.
• Updated CI to support the new nightly releases by Aries, with the help of @C0D3-M4513R
• Created a new CI workflow for pushing manual releases of Realtime SDK, as it's independent of generated SDK and will need manual releases.

Some things to consider:

• I didn't have time to fully test every event, so I need the community's help to come test and verify everything is correct.
• I used Claude Code to help me generate the models for the event types, I did my best to verify accuracy but I fear there may be some mistakes that need to be fixed
• This library is not generated at all, so it will need to be maintained by hand, and that's why it's a separate package from the others.

Please let me know your thoughts and any testing you encounter.

[Jarno458]

LGTM
but i didnt fully review the container files / scripts, i am not really good with linux stuff

Remark: you added the vrc_cat.png this might be a copyright issue

[jellejurre]

I dont think we can include vrccat due to licensing issues

[binn]

I can remove them but I'd like there to be a package icon. Can one of you make some assets and send it to me over Discord? I need the same icon as png and ico format. Must be a square icon.