docs: add documentation for webhook #2534

Job	Run time
create-version	3s
lint-api	1m 21s
test-api	3m 48s
test-batch-predictor (3.8)	35s
test-batch-predictor (3.9)	33s
test-batch-predictor (3.10)	34s
test-python-sdk (3.8)	1m 2s
test-python-sdk (3.9)	1m 4s
test-python-sdk (3.10)	49s
build-ui	1m 45s
test-observation-publisher	47s
test-pyfunc-server (3.8)	3m 51s
test-pyfunc-server (3.9)	3m 41s
test-pyfunc-server (3.10)	3m 37s
build-inference-logger	1m 40s
build-transformer	2m 6s
build-batch-predictor-base-image	3m 34s
build-observation-publisher	2m 8s
build-api	2m 24s
build-pyfunc-server-base-image	2m 37s
e2e-test	14m 0s
release / publish-api	11s
release / publish-merlin-batch-predictor	0s
release / publish-python-sdk	0s
release / publish-merlin-pyfunc-server	0s
release / publish-batch-predictor-base-image	1m 27s
release / publish-inference-logger	6s
release / publish-pyfunc-server-base-image	1m 26s
release / publish-transformer	8s
release / publish-observation-publisher	1m 54s
release / publish-python-sdk-docker	0s
	57m 11s

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