CANN Backend support #2634

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 4s
build-and-push-docker-images	25s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 49s
build-python-wheels (ubuntu-20.04, auto64)	26m 3s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 30s
check-python-style	10s
build-python-wheels (macos-11, auto64)	37m 39s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 29s
build-python-wheels (windows-2019, auto64)	45m 35s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 54s
build-python-wheels (ubuntu-20.04, aarch64)	1h 11m 21s
build-python-wheels (macos-11, arm64)	11m 20s
test-python-wheels (ubuntu-20.04)	8m 56s
build-and-deploy-docs	0s
test-python-wheels (macos-11)	3m 42s
test-python-wheels (windows-2019)	4m 4s
publish-python-wheels-on-pypi	0s
	4h 5m 1s

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