Add optical flow setup capability

It would be great to be able to use mission planner for optical flow setup.

At the moment, you need to use an old version of qground to set it up (focusing the lens...)

No file, test, or entry point is identified. Start by locating Mission Planner's existing sensor or optical-flow setup flow and compare it with the old QGroundControl workflow mentioned in the issue, especially lens focusing; confirm the required setup steps and define completion criteria before choosing an implementation path.

Written by the indexing model from the issue text.