feat!: [downloader] `c-api`と`additional-libraries`のディレクトリを掘る #1548

Job	Run time
actionlint	19s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 35s
rust-integration-test-strategy-matrix	1s
c-header	50s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 48s
rust-unit-test	12m 58s
rust-lint	10m 21s
shellcheck	19s
validate-cargo-lock	27s
build-and-test-java-api (windows-latest)	7m 15s
build-and-test-python-api (windows-latest)	10m 23s
build-and-test-java-api (macos-latest)	3m 7s
build-windows-cpp-example	4m 43s
build-and-test-python-api (macos-latest)	4m 51s
build-and-test-java-api (ubuntu-latest)	3m 24s
build-and-test-python-api (ubuntu-latest)	5m 48s
rust-integration-test (macos-13)	6m 45s
rust-integration-test (ubuntu-20.04)	4m 42s
	1h 19m 36s

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