test_utilクレートを`dev-dependencies`に #2197

Job	Run time
c-header	1m 13s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 37s
actionlint	29s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 32s
rust-integration-test-strategy-matrix	1s
rust-lint	13m 26s
rust-unit-test	4m 52s
shellcheck	19s
validate-cargo-lock	40s
build-and-test-java-api (windows-latest)	11m 18s
build-and-test-java-api (macos-latest)	4m 43s
build-and-test-python-api (windows-latest)	9m 52s
build-and-test-java-api (ubuntu-latest)	4m 47s
build-and-test-python-api (macos-latest)	6m 4s
build-and-test-python-api (ubuntu-latest)	4m 37s
build-windows-cpp-example	6m 17s
rust-integration-test (windows-2019, directml)	4m 35s
rust-integration-test (macos-11)	2m 35s
rust-integration-test (ubuntu-20.04)	1m 58s
	1h 25m 55s

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