refactor: `cstr!("…")`を`c"…"`に置き換える #2689

Job	Run time
actionlint	32s
rust-lint	7m 0s
rust-unit-test	9m 20s
shellcheck	15s
validate-cargo-lock	27s
build-and-test-java-api (windows-latest)	6m 41s
build-and-test-java-api (macos-latest)	3m 1s
build-and-test-java-api (ubuntu-latest)	2m 51s
build-and-test-python-api (windows-latest)	8m 22s
build-and-test-python-api (macos-latest)	3m 37s
build-and-test-python-api (ubuntu-latest)	3m 3s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	2m 16s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 36s
build-windows-cpp-example	4m 57s
c-header	25s
rust-integration-test-strategy-matrix	1s
rust-integration-test (windows-2019, directml)	7m 13s
rust-integration-test (macos-11)	7m 37s
rust-integration-test (ubuntu-20.04)	2m 51s
	1h 12m 5s

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