CANN Backend support #2636

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 6s
build-python-wheels (ubuntu-20.04, auto64)	26m 24s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	7m 53s
build-and-push-docker-images	22m 13s
build-python-wheels (macos-11, auto64)	34m 57s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 6s
check-python-style	9s
build-python-wheels (windows-2019, auto64)	44m 37s
build-python-wheels (ubuntu-20.04, aarch64)	1h 12m 39s
build-and-test-cpp-x86_64 (macos-11, mkl)	9m 56s
build-python-wheels (macos-11, arm64)	11m 6s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 13s
build-and-deploy-docs	46s
test-python-wheels (ubuntu-20.04)	10m 17s
test-python-wheels (macos-11)	4m 50s
test-python-wheels (windows-2019)	4m 38s
publish-python-wheels-on-pypi	0s
	4h 28m 50s

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