[Epic] Enable automatic reconnection in SignalR clients

[analogrelay]

We should allow users to opt-in to automatic reconnection in all of our clients. Message replay is a non-goal for this feature at this time.

Child Issues:

• Support automatic reconnect in the TypeScript client #8709 Support automatic reconnect in the TypeScript client
• Support automatic reconnect in the C++ client #8712 Support automatic reconnect in the C++ client Cut for 3.0.
• Support automatic reconnect in the Java client #8711 Support automatic reconnect in the Java client Postponed to post-3.0
• Support automatic reconnect in the .NET client #8710 Support automatic reconnect in the .NET client (3.0.0-preview6)
• Error parsing handshake response during reconnect #6434 Error parsing handshake response during reconnect
• Add ReconnectPolicyBuilder to SignalR TS client #9016 Add ReconnectPolicyBuilder to SignalR TS client Cut, waiting for customer feedback. Not necessary for 3.0.
• Allow IReconnectPolicy.nextRetryDelayInMilliseconds to return a promise in the SignalR TS client #9017 Allow IReconnectPolicy.nextRetryDelayInMilliseconds to return a promise in the SignalR TS client Cut, waiting for customer feedback. Not necessary for 3.0.