Implement to_device() for python bindings, add unit tests #2643

Job	Run time
build-and-test-cpp-aarch64 (openblas)	3m 53s
build-and-push-docker-images	23m 48s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 26s
build-python-wheels (ubuntu-20.04, auto64)	26m 24s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 20s
check-python-style	10s
build-python-wheels (macos-11, auto64)	36m 28s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 24s
build-python-wheels (windows-2019, auto64)	41m 51s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 35s
build-python-wheels (ubuntu-20.04, aarch64)	1h 9m 41s
build-python-wheels (macos-11, arm64)	12m 12s
build-and-deploy-docs	29s
test-python-wheels (ubuntu-20.04)	10m 26s
test-python-wheels (macos-11)	4m 59s
test-python-wheels (windows-2019)	11m 58s
publish-python-wheels-on-pypi	0s
	4h 33m 4s

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