Support automatic reconnect in the C++ client

[analogrelay]

Split from #5282

Epic #5301
Epic #8797

We will support automatic reconnect in 3.0 without message replay. We will also allow customization of the reconnect logic. This will be opt-in via a HubConnectionBuilder option. The default behavior will continue to be manual reconnection.

[analogrelay]

Triage decision: Cut for 3.0. Can revisit given customer need.