[SignalR] Provide a way for Azure SignalR to read HttpConnectionDispatcherOptions

[vicancy]

Current issue

SignalR provided a auth expiration feature in Close connection on auth expiration by BrennanConroy · Pull Request #32431, however, the option CloseOnAuthenticationExpiration is in HttpConnectionDispatcherOptions, this is one Option that Azure SignalR SDK is not able to fetch out value from.

A similar issue we encountered before is the TransportType option, since we are not able to fetch the TransportType value out from the option, we add a similar option in Service SDK

Proposed solution

It would be great if there is a way for the Azure SignalR SDK to read HttpConnectionDispatcherOptions, so that we don't need to create a similar option in the service SDK and users don't need to set a similar Option when using service SDK.

[davidfowl]

@BrennanConroy maybe we can stash this in endpoint metadata?

[BrennanConroy]

stash this in endpoint metadata

That sounds like it's the best we can do at this point, can't backtrack and make the options come from DI now.

[BrennanConroy]

@vicancy Would adding endpoint metadata that contains the HttpConnectionDispatcherOptions work for you?

Similar to how we have the HubMetadata and NegotiateMetadata that the service uses https://github.com/Azure/azure-signalr/blob/16029cbde8f45af6fbac2923c5b7102e34d5a0c9/src/Microsoft.Azure.SignalR/Startup/AzureSignalRHostedService.cs#L30-L31

[vicancy]

Sounds good, cc @Y-Sindo