Rust APIが公開するエラーの種類を`ErrorKind`として表現する #1959

Job	Run time
actionlint	20s
rust-lint	3m 13s
rust-unit-test	3m 54s
shellcheck	22s
validate-cargo-lock	34s
build-and-test-python-api (windows-latest)	5m 39s
build-and-test-python-api (macos-latest)	4m 6s
build-and-test-python-api (ubuntu-latest)	3m 6s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 42s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 10s
c-header	1m 26s
build-windows-cpp-example	6m 42s
rust-integration-test-strategy-matrix	1s
rust-integration-test (windows-2019, directml)	3m 10s
rust-integration-test (macos-11)	1m 31s
rust-integration-test (ubuntu-20.04)	57s
	41m 53s

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