Add support for mavlink events interface #41066

Job	Run time
build (stm32f7, chibios, 10)	57s
build (stm32h7, chibios, 10)	57s
build (fmuv2-plane, chibios, 10)	1m 8s
build (periph-build, chibios, 10)	1m 14s
build (iofirmware, chibios, 10)	3m 48s
build (CubeOrange-bootloader, chibios, 10)	3m 1s
build (fmuv3-bootloader, chibios, 10)	3m 16s
build (revo-bootloader, chibios, 10)	3m 2s
build (stm32h7-debug, chibios, 10)	56s
build (fmuv3, chibios, 10)	2m 36s
build (revo-mini, chibios, 10)	2m 17s
build (MatekF405-Wing, chibios, 10)	2m 34s
build (CubeOrange-ODID, chibios, 10)	58s
build (CubeRedPrimary-bootloader, chibios, 10)	2m 57s
build (configure-all, chibios, 10)	12m 47s
build (build-options-defaults-test, chibios, 10)	2m 45s
build (signing, chibios, 10)	1m 4s
build (CubeOrange-PPP, chibios, 10)	53s
build (SOHW, chibios, 10)	1m 1s
build (Pixhawk6X-PPPGW, chibios, 10)	55s
build (new-check, chibios, 10)	1m 53s
	50m 59s

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