AP_ExternalAHRS: added ANU CINS state estimator #32304

Job	Run time
build (chibios, Durandal)	25m 24s
build (chibios, MatekF405)	22m 20s
build (chibios, KakuteF7)	21m 7s
build (chibios, MatekH743-bdshot)	11m 19s
build (chibios, Pixhawk1-1M)	23m 7s
build (chibios, MatekF405-CAN)	4m 11s
build (chibios, DrotekP3Pro)	4m 10s
build (chibios, Hitec-Airspeed)	6m 12s
build (chibios, f103-GPS)	6m 1s
build (disco, armhf)	8m 6s
	2h 11m 57s

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