IOが発生するメソッドをすべてasync化する #2307

Job	Run time
actionlint	15s
c-header	47s
rust-integration-test-strategy-matrix	2s
rust-lint	3m 39s
rust-unit-test	4m 29s
shellcheck	10s
validate-cargo-lock	21s
build-and-test-java-api (windows-latest)	5m 59s
build-and-test-java-api (macos-latest)	4m 13s
build-and-test-java-api (ubuntu-latest)	2m 34s
build-and-test-python-api (windows-latest)	6m 3s
build-and-test-python-api (macos-latest)	6m 33s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 1s
build-windows-cpp-example	5m 41s
build-and-test-python-api (ubuntu-latest)	2m 51s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 9s
rust-integration-test (windows-2019, directml)	3m 3s
rust-integration-test (macos-11)	7m 7s
rust-integration-test (ubuntu-20.04)	1m 9s
	1h 1m 6s

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