Add Clone for SyncConnectionWrapper

[pickfire]

Clone is needed for some async stuff like teloxide.

See discussion in teloxide/teloxide#1124

[weiznich]

Thanks for opening this PR.

Unfortunately I don't think it's a great idea to implement Clone for any connection type as you generally do not want to share the connection in that way. Instead prefer using a connection pool. These pool types usually implement Clone (and Sync) which makes them ideal candidates for being part of a service state. It also allows your service to use more than one connection at the same time.

For this particular type there is the additional constraint that some of the internal code (e.g the implementation for the instrumentation function) relies on the fact that the connection cannot be cloned.

[pickfire]

Thanks, that seemed to be able to solve the issue.