Review pubternal types in SignalR and make them internal or public

[analogrelay]

Pubternal is so last year. Let's review SignalR pubternal types and make decisions about what we want to make public and if there's anything we want to take internal.

[halter73]

@anurse Should we file a similar issue for Kestrel and all the other solutions that still have pubternal types? Or do we want this issue to track that as well?

[halter73]

Never mind. We merged #8517 already. #8308 is probably what we'd consider the "Epic" for this issue.

[analogrelay]

The first work item here is to find them and list them.

[mikaelm12]

Microsoft.AspNetCore.Http.Connections.Client.Internal (Make these internal)

• ITransport
• ITransportFactory
• LongPollingTransport
• ServerSentEventsTransport
• WebsocketsTransport

Microsoft.AspNetCore.Http.Connections.Internal.Transports (Make these internal)

• IHttpTransport
• LongPollingTransport
• ServerSentEventsTransport
• WebSocketsTransport
  Microsoft.AspNetCore.Http.Connections.Internal
• ServerSentEventsMessageFormatter

Microsoft.AspNetCore.SignalR.Internal (Make these internal, except...)

• DefaultHubActivator
• DefaultHubCallerContext
• DefaultHubDispatcher
• DefaultHubProtocolResolver
• HubCallerClients
• HubDispatcher (Make this public)
• HubOptionsSetup
• HubOptionsSetup
• HubReflectionHelper
• TypeBaseEnumerationExtensions

Microsoft.AspNetCore.SignalR.StackExchangeRedis.Internal (Make these internal)

• GroupAction
• RedisGroupCommand
• RedisInvocation
• RedisProtocol

Edit More Pubternal Types
Microsoft.AspNetCore.Http.Connections.Internal.

• HttpConnectionContext
• HttpConnectionDispatcher
• HttpConnectionManager
• HttpConnectionStatus