AP_ExternalAHRS: added ANU CINS state estimator #43532

Job	Run time
build (stm32f7, chibios, 10)	14m 27s
build (stm32h7, chibios, 10)	13m 25s
build (fmuv2-plane, chibios, 10)	6m 55s
build (periph-build, chibios, 10)	11m 24s
build (iofirmware, chibios, 10)	4m 12s
build (CubeOrange-bootloader, chibios, 10)	3m 7s
build (fmuv3-bootloader, chibios, 10)	3m 12s
build (revo-bootloader, chibios, 10)	3m 17s
build (stm32h7-debug, chibios, 10)	8m 41s
build (fmuv3, chibios, 10)	14m 56s
build (revo-mini, chibios, 10)	12m 3s
build (MatekF405-Wing, chibios, 10)	10m 24s
build (CubeOrange-ODID, chibios, 10)	9m 30s
build (CubeRedPrimary-bootloader, chibios, 10)	3m 1s
build (configure-all, chibios, 10)	13m 11s
build (build-options-defaults-test, chibios, 10)	24m 26s
build (signing, chibios, 10)	9m 54s
build (CubeOrange-PPP, chibios, 10)	8m 28s
build (CubeRed-EKF2, chibios, 10)	8m 33s
build (SOHW, chibios, 10)	12m 1s
build (Pixhawk6X-PPPGW, chibios, 10)	4m 22s
build (new-check, chibios, 10)	14m 55s
	3h 34m 24s

Provide feedback