Accept variable-length batch prompts for Whisper #2897

Job	Run time
build-and-push-docker-images	30m 4s
build-and-test-cpp-aarch64 (openblas)	4m 29s
build-python-wheels (ubuntu-20.04, auto64)	36m 37s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 5s
build-python-wheels (windows-2019, auto64)	51m 22s
check-python-style	13s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 55s
build-python-wheels (ubuntu-20.04, aarch64)	1h 19m 27s
build-python-wheels (macos-12, arm64)	7m 5s
test-python-wheels (ubuntu-20.04)	9m 8s
build-and-deploy-docs	27s
test-python-wheels (windows-2019)	3m 48s
publish-python-wheels-on-pypi	0s
	3h 54m 40s

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