* fix(wss): Use a queue on the server to avoid "InvalidOperationException: Invalid nested call."

* Remove unnecessary "private"

Co-Authored-By: Katori <[email protected]>

* Remove unnecessary "private"

Co-Authored-By: Katori <[email protected]>

* Update Server.cs

* comment: explain what is going on here

* comments:  better comment

* Move queue into WebSocketImplementation instead of Server-specific

* Remove unused variables in Server

* Use a SemaphoreSlim instead of queue system