Request mode change for action MAV_CMD_DO_REPOSITION

[Jaeyoung-Lim]

Problem Description
The goto action in the examples of MAVSDK-Python is currently broken with PX4 main (reported in mavlink/MAVSDK-Python#633)

PX4 returns an unsupported error, as the following.

Traceback (most recent call last):
  File "goto.py", line 47, in <module>
    asyncio.run(run())
  File "/usr/lib/python3.8/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "goto.py", line 38, in run
    await drone.action.goto_location(47.397606, 8.543060, flying_alt, 0)
  File "/home/yunpeng/.local/lib/python3.8/site-packages/mavsdk/action.py", line 548, in goto_location
    raise ActionError(result, "goto_location()", latitude_deg, longitude_deg, absolute_altitude_m, yaw_deg)
mavsdk.action.ActionError: UNSUPPORTED: 'Unsupported'; origin: goto_location(); params: (47.397606, 8.54306, 508.1050109863281, 0)

It seems that this is a regression from PX4/PX4-Autopilot#22078, where PX4 requires a mode switch request to be set

Testing
Was not able to test it yet, given that the problem is in MAVDK python.

[julianoes]

Thanks @Jaeyoung-Lim

[julianoes]

Perfect.