Support local recording

[patrickelectric]

Something like the following should be implemented in the camera manager to support local video recording

• It should support local video recording
  • It should record as a single file or breaking it in 10s
• Record can be done using MAVLink (MAV_CMD_VIDEO_START_CAPTURE) and via REST API
• Recording status should be exposed via MAVLink (CAMERA_CAPTURE_STATUS) and via REST API
• MCM should provide a component id for itself, not the streams, where parameter could be used to control things like mission names
• Files/Chunks should be store with incremental names \d+.mp4.part (?) inside a "temporary" folder (not true temporary, but for the process) until is complete
• The folder should be named using an uuid4
• The folder should move to a finished location once the record is done
• With the folder, a metadata.json (?) file should be used to store information about the recorded video and session
  • Camera component ID (for order/serialization)
  • Mission name (based on PARAM_EXT_VALUE)
  • Finished status (Done [boolean])
• MCM should provide a frontend and a rest api where it would be possible to:
  • Start recording
  • List available records
  • Download videos
    • Merge chunks before download
      It would be nicer if:
• CAMERA_CAPTURE_STATUS includes a stream ID similar to MAV_CMD_VIDEO_START_CAPTURE
• MAV_CMD_VIDEO_START_CAPTURE includes a human-readable name
• Component ID (130) is reserved to a camera manager