* Set active gateway after setting up gateway in base client
* Elevate log statements in gateway setup
* Add debug implementations for some gateway setup types
* Rework gateway setup in rust sdk mixnet client
* Remove unused KeyMode type
* Remove pub from internal setters
* Remove pseudo builder methods
* Make create_bandwidth_client pub
* Downgrade log statement to debug
* Revert set_active_gateway in base_client
* Rename to set_active_gateway_if_previously_registered