Add support for mavlink events interface #32234

Job	Run time
build (chibios, Durandal)	13m 40s
build (chibios, MatekF405)	11m 10s
build (chibios, KakuteF7)	11m 5s
build (chibios, MatekH743-bdshot)	13m 27s
build (chibios, Pixhawk1-1M)	12m 36s
build (chibios, MatekF405-CAN)	3m 55s
build (chibios, DrotekP3Pro)	3m 57s
build (chibios, Hitec-Airspeed)	2m 46s
build (chibios, f103-GPS)	2m 52s
build (disco, armhf)	11m 43s
	1h 27m 11s

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