AP_Camera/AP_Mount: camera info msg gets device id to improve multi camera support

[rmackay9]

This is a rebased version of PR #24354

This PR allows ground station to know which camera is in which gimbal

• mavlink module updated to HEAD so that the camera info message includes the gimbal id field (see Update gimbal manager v2 messages: mavlink#323)
• AP_Mount backends (default, MAVLinkCAMv2, Siyi, ViewPro, Xacti) fill in the gimbal_device_id field of the CAMERA_INFORMATION mavlink message

There is an additional drive-by enhancement to vehicle's actual z-axis rotation rate which only affects MAVLink enabled gimbals which means the Gremsy gimbals.

This has been lightly tested on real hardware including a Gremsy PixyU. Testing included:

• Added debug messages to confirm that the expected "gimbal_device_id" was sent when using a Siyi A8. MP's mavlink inspector does not yet know about this new field yet because it is still using the older mavlink definitions
• Added debug to output the AHRS yaw rate and then moved the vehicle around to confirm the expected values were output. Also tested that the PixyU still moved as expected.

@Davidsastresas, @khanasif786, @peterbarker could you confirm that you're happy with this PR?

[Davidsastresas]

Thanks Randy!