CANN Backend support #2633

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 2s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 52s
build-python-wheels (ubuntu-20.04, auto64)	26m 10s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 16s
build-and-push-docker-images	17s
build-python-wheels (macos-11, auto64)	34m 51s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 32s
build-python-wheels (windows-2019, auto64)	41m 46s
check-python-style	9s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 39s
build-python-wheels (ubuntu-20.04, aarch64)	1h 11m 45s
build-python-wheels (macos-11, arm64)	11m 46s
test-python-wheels (ubuntu-20.04)	9m 21s
build-and-deploy-docs	0s
test-python-wheels (macos-11)	4m 0s
test-python-wheels (windows-2019)	3m 52s
publish-python-wheels-on-pypi	0s
	4h 0m 18s

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