Implement to_device() for python bindings, add unit tests #2641

Job	Run time
build-python-wheels (ubuntu-20.04, auto64)	58s
build-python-wheels (ubuntu-20.04, auto64)	58s
build-and-push-docker-images	22m 1s
build-and-push-docker-images	22m 1s
build-python-wheels (macos-11, auto64)	35s
build-python-wheels (macos-11, auto64)	35m 19s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 46s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 46s
build-and-test-cpp-aarch64 (openblas)	4m 17s
build-and-test-cpp-aarch64 (openblas)	4m 17s
build-python-wheels (windows-2019, auto64)	53s
build-python-wheels (windows-2019, auto64)	53s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 13s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 13s
build-python-wheels (ubuntu-20.04, aarch64)	59s
build-python-wheels (ubuntu-20.04, aarch64)	59s
check-python-style	14s
check-python-style	14s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 28s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 28s
build-python-wheels (macos-11, arm64)	55s
build-python-wheels (macos-11, arm64)	55s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 22s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 22s
test-python-wheels	0s
test-python-wheels	0s
build-and-deploy-docs	0s
build-and-deploy-docs	0s
publish-python-wheels-on-pypi	0s
publish-python-wheels-on-pypi	0s
	2h 42m 6s

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