docs: add documentation for webhook #2526

Job	Run time
lint-api	1m 26s
create-version	4s
test-batch-predictor (3.8)	33s
build-ui	1m 50s
test-batch-predictor (3.9)	39s
test-batch-predictor (3.10)	36s
test-api	3m 44s
test-observation-publisher	45s
test-pyfunc-server (3.8)	3m 43s
test-pyfunc-server (3.9)	3m 48s
test-python-sdk (3.8)	48s
test-pyfunc-server (3.10)	3m 47s
test-python-sdk (3.9)	57s
test-python-sdk (3.10)	50s
build-transformer	2m 32s
build-inference-logger	1m 29s
build-batch-predictor-base-image	3m 44s
build-observation-publisher	3m 20s
build-api	2m 23s
build-pyfunc-server-base-image	2m 42s
e2e-test	13m 35s
release / publish-api	15s
release / publish-inference-logger	12s
release / publish-batch-predictor-base-image	2m 15s
release / publish-merlin-batch-predictor	0s
release / publish-merlin-pyfunc-server	0s
release / publish-observation-publisher	1m 46s
release / publish-pyfunc-server-base-image	57s
release / publish-python-sdk	0s
release / publish-transformer	24s
release / publish-python-sdk-docker	0s
	59m 4s

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