Investigate other WebRTC implementation in C# to replace SIPSorcery due to its high GC pressure

[Hong-Xiang]

Candidates:

• libdatachannel, need bindings
• use WebView, it can also provide easier video encoding, but requires Windows OS and need a actual window, and need complex architecture
• use libCef, need find way for interop process memory sharing (or how to share host buffer to js's array buffer without copying), also like webview2, may need more complex architecture

[Hong-Xiang]

We may investigate priority of turing back to WebView2 based WebRTC implementation, since SIPSorcery's media related abstraction may be hard to abstract as standard WebRTC interface, at least for capture meadia stream for headless surfaces, in WebView2, we can use canvas to implement it, but for SIPSorcery, I can't find proper way to create a media stream with correct id semantic

[Hong-Xiang]

Using WebView2 as RTC implementation now. In the future we should investigate libdatachannel and media encoder/decoder libraries