[DOC] Add extension APIs to runtime API reference (#19385) #4616

Job	Run time
test-arm / test-backend-linux (arm_tosa_int, operators) / linux-job	1h 6m 51s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	25m 30s
test-arm / test-backend-linux (arm_vgf_int, models) / linux-job	39m 42s
test-arm / test-backend-linux (arm_vgf_int, operators) / linux-job	1h 11m 41s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	26m 14s
test-arm / test-backend-linux (arm_tosa_int, models) / linux-job	39m 38s
test-arm / test-backend-linux (arm_ethos_u85, models) / linux-job	47m 49s
test-arm / test-backend-linux (arm_ethos_u55, models) / linux-job	48m 55s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	22m 39s
test-arm / test-backend-linux (arm_ethos_u55, operators) / linux-job	55m 51s
test-arm / test-backend-linux (arm_ethos_u85, operators) / linux-job	59m 39s
test-arm / test-backend-macos	-1s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	25m 47s
test-arm / package-golden-artifacts	45s
	8h 51m 0s

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