Automatic reconnect ignores settings applied for the connection

[pet74alex]

Client::Impl::RetryGuard performs automatic connection resets so the application code doesn't have a chance to restore expected connection settings applied before executing the current request.

For example, SET mutations_sync=2, automatic reconnect, ALTER TABLE sequence causes mutations to be executed asynchronously when the application assumes synchronous execution of the mutation.

It looks like connection settings should be stored in the Client::Impl and they should be re-applied in case of such reconnect before executing the client query.