[Epic] SignalR Streaming Improvements

[analogrelay]

Users should be able to stream data from the client to the server, like they can from server-to-client in 2.x. Also we want to support IAsyncEnumerable in all streaming scenarios.

Child issues:

• Remove CancelableAsyncEnumerable #7960 Remove CancelableAsyncEnumerable Cut from 3.0.
• Implement support for IAsyncEnumerable in the .NET client #5376 Implement support for IAsyncEnumerable in the .NET client
• Send completion from server in Client to Server streaming #7070 Send completion from server in Client to Server streaming Postponed
• Implement support for IAsyncEnumerable parameters on the Server and on the Client #7930 Implement support for IAsyncEnumerable parameters on the Server
• Allow the user to configure the bounds used for the client->server streaming channel #4399 Allow the user to configure the bounds used for the client->server streaming channel