Record button: Add an option for cockpit to ask camera to record locally (on vehicle)

https://mavlink.io/en/messages/common.html#MAV_CMD_VIDEO_START_CAPTURE
https://mavlink.io/en/messages/common.html#MAV_CMD_VIDEO_STOP_CAPTURE

ref: https://github.com/bluerobotics/cockpit/issues/698

This can also help us to sync video and telemetry.

Start by reading the linked MAV_CMD_VIDEO_START_CAPTURE and MAV_CMD_VIDEO_STOP_CAPTURE documentation, then review the referenced cockpit issue 698 for context. Identify where cockpit exposes camera recording controls and define the option so it can request local vehicle recording; completion should cover both start and stop behavior and the intended video/telemetry synchronization.

Written by the indexing model from the issue text.