Fix Connection Error: Success

[jdetter]

Description of Changes

This PR edits the handling of errors related to websocket connections and disconnections. In particular, clients and users would often run into the dreaded Connection Error: Success message which was confusing and frustrating. This PR better addresses the error by providing more guidance and debug info for the user. It is unfortunately still suboptimal because the HttpStatusCode is not available in the .NET core version that Unity supports. We try to be as helpful as possible in this scenario.

API

• [x] This is an API breaking change to the SDK, because it changes the returned values from the OnDisconnect and OnConnectError callbacks to implement the API specification: https://github.com/clockworklabs/SpacetimeDBPrivate/pull/866/files#diff-be533cc04817c33605a68d717c6ec320c4449904266ee8e1096971e9e17e8d31R424

Requires SpacetimeDB PRs

No changes to SpacetimeDB required.

Testing

I, Tyler, have tested this and confirmed it to be working with CircleGame. Here is a sample of the output in the case of Connection Error: Success:

[cloutiertyler]

Put it to rest, once and for all!