Configure or disable timeouts on long running requests

[Tratcher]

#46115 adds new request timeout middleware. If a default timeout is configured it could impact long running requests like WebSockets, SignalR, gRPC streaming, etc. These components should consider disabling the timeout for their endpoints, or via the IHttpRequestTimeoutFeature once they transition to long running mode (e.g. after the WebSocket accept).

• WebSocket middleware
• SignalR
• gRPC streaming

[adityamandaleeka]

Triage:

• For WebSocket middleware, on upgrade, cancel the timeout using DisableTimeout on HttpRequestTimeoutFeature.
• For SignalR, disable the timeout globally.
• For gRPC, disable the timeout for streaming methods by default, and provide an option to opt into the timeout per method. Also consider allowing people to override the timeout with their own different value.

Notes:

• Need to watch out for middleware ordering issues (don't want to use the feature too soon).

[JamesNK]

gRPC is done in JamesNK/grpc-dotnet#5

Note that it is in a net80 branch. Won't be merged into master and released until .NET 8 is RC.