refactor: Rust APIにおけるgetterをパブリックAPIとして整える #2767

Job	Run time
actionlint	21s
shellcheck	17s
validate-cargo-lock	23s
build-and-test-java-api (windows-latest)	6m 57s
build-and-test-java-api (macos-latest)	3m 29s
build-and-test-java-api (ubuntu-latest)	2m 53s
build-and-test-python-api (windows-latest)	6m 9s
build-and-test-python-api (macos-latest)	3m 4s
build-and-test-python-api (ubuntu-latest)	3m 0s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 33s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 41s
build-windows-cpp-example	4m 13s
c-header	46s
rust-integration-test-strategy-matrix	1s
rust-lint	3m 18s
rust-unit-test	3m 58s
rust-integration-test (windows-2019, directml)	3m 15s
rust-integration-test (macos-12)	3m 7s
rust-integration-test (ubuntu-20.04)	1m 31s
	49m 56s

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