AP_ExternalAHRS: added ANU CINS state estimator #34193

Job	Run time
build (chibios, Durandal)	26m 58s
build (chibios, MatekF405)	22m 14s
build (chibios, KakuteF7)	21m 0s
build (chibios, MatekH743-bdshot)	26m 8s
build (chibios, Pixhawk1-1M)	22m 39s
build (chibios, MatekF405-CAN)	4m 8s
build (chibios, DrotekP3Pro)	4m 7s
build (chibios, Hitec-Airspeed)	6m 12s
build (chibios, f103-GPS)	6m 3s
build (disco, armhf)	23m 23s
	2h 42m 52s

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