Add suport for MAV_CMD_DO_SET_ROI_LOCATION in AP_Mission

[bytesByHarsh]

Feature request

Currently only in GCS_Common.cpp file MAV_CMD_DO_SET_ROI_LOCATION support is added, the command sent via Command Long Packet is parsed properly but when MAV_CMD_DO_SET_ROI_LOCATION is sent as a mission item it returns MAV_RESULT_UNSUPPORTED to GCS.

Describe the solution you'd like
A possible solution can be adding a switch statement in the AP_mission.cpp file for MAV_CMD_DO_SET_ROI_LOCATION.

Platform
[ X ] All
[ ] AntennaTracker
[ ] Copter
[ ] Plane
[ ] Rover
[ ] Submarine

If required I can create a MR for adding these changes in the code.

[bytesByHarsh]

Also if possible can we add the support for MAV_CMD_DO_SET_ROI_NONE as well.

[DonLakeFlyer]

Related to QGC problems discussed here: mavlink/qgroundcontrol#11963

QGC also uses MAV_CMD_DO_SET_ROI_WPNEXT_OFFSET for structure scan missions