Hrishikesh Gohain

Ap_Scheduler: initialize _active_loop_rate_hz in loop() and remove check in get_loop_rate_hz()

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- issue: #30234 - an extra check was made on every call of get_loop_rate_hz() for _active_loop_rate_hz == 0 - remove extra check and initialize the value of _active_loop_rate_hz in AP_Scheduler::loop()...

common.xml: add GRIPPER_ACTION_STOP message

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Adds `GRIPPER_ACTION_STOP` action to allow grippers to stop and maintain their current position. I'm aware of commit [1af26163ed1b018ca2ef3b93fe78469ba35269cc](https://github.com/mavlink/mavlink/commit/c748e54d9ba16633a69bda58d5a25b715bbdd0a5) in mavlink/mavlink which renames other gripper enum entries. I have not included...