Accept variable-length batch prompts for Whisper #2896

Job	Run time
build-and-test-cpp-aarch64 (openblas)	3m 0s
build-and-push-docker-images	27m 6s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	2m 41s
build-python-wheels (ubuntu-20.04, auto64)	2m 22s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	2m 27s
check-python-style	9s
build-python-wheels (windows-2019, auto64)	2m 10s
build-python-wheels (ubuntu-20.04, aarch64)	2m 24s
build-python-wheels (macos-12, arm64)	2m 5s
build-and-deploy-docs	0s
test-python-wheels	0s
publish-python-wheels-on-pypi	0s
	44m 24s

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