Support Gemma model #2657

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 6s
build-python-wheels (ubuntu-20.04, auto64)	12m 35s
build-and-push-docker-images	12m 37s
build-python-wheels (macos-11, auto64)	12m 34s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 39s
build-python-wheels (windows-2019, auto64)	14m 8s
check-python-style	10s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 0s
build-python-wheels (ubuntu-20.04, aarch64)	12m 35s
build-and-test-cpp-x86_64 (macos-11, mkl)	11m 7s
build-python-wheels (macos-11, arm64)	12m 35s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 54s
test-python-wheels	1s
build-and-deploy-docs	1s
publish-python-wheels-on-pypi	1s
	1h 53m 3s

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