Add Columnstore operations to MariaDB Monitor

Currently the call commands of the monitor using which the Columnstore cluster can be manipulated are synchronous. This makes them ill suited for use from MaxGUI, as without extra effort on MaxGUI's side it would made the UI unresponsive for the duration of the call.

As csmon is obsolete, the functionality should be moved from csmon to mariadbmon, while at the same time making them asynchronous.