RustのdoctestをCI #1856

Job	Run time
actionlint	19s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	7m 20s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 18s
c-header	1m 25s
rust-integration-test-strategy-matrix	1s
rust-lint	3m 46s
rust-unit-test	10m 3s
shellcheck	15s
build-windows-cpp-example	7m 17s
build-and-test-python-api (windows-latest)	14m 10s
build-and-test-python-api (macos-latest)	7m 35s
build-and-test-python-api (ubuntu-latest)	5m 45s
validate-cargo-lock	35s
rust-integration-test (windows-2019, directml)	6m 22s
rust-integration-test (macos-11)	2m 35s
rust-integration-test (ubuntu-20.04)	1m 53s
	1h 12m 39s

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