CANN Backend support #2635

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 7s
build-and-push-docker-images	22m 50s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 51s
build-python-wheels (ubuntu-20.04, auto64)	26m 2s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 19s
check-python-style	8s
build-python-wheels (macos-11, auto64)	34m 45s
build-and-test-cpp-x86_64 (macos-11, mkl)	9m 53s
build-python-wheels (windows-2019, auto64)	44m 41s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 9s
build-python-wheels (ubuntu-20.04, aarch64)	1h 11m 20s
build-python-wheels (macos-11, arm64)	11m 52s
test-python-wheels (ubuntu-20.04)	9m 34s
build-and-deploy-docs	29s
test-python-wheels (macos-11)	3m 43s
test-python-wheels (windows-2019)	4m 10s
publish-python-wheels-on-pypi	0s
	4h 23m 53s

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