downloadクレートをdownloaderクレートに #2142

Job	Run time
actionlint	22s
rust-integration-test-strategy-matrix	3s
rust-lint	4m 18s
rust-unit-test	10m 33s
validate-cargo-lock	34s
build-and-test-java-api (windows-latest)	11m 56s
build-and-test-java-api (macos-latest)	6m 8s
build-and-test-java-api (ubuntu-latest)	4m 16s
build-and-test-python-api (windows-latest)	10m 49s
build-and-test-python-api (macos-latest)	7m 24s
build-and-test-python-api (ubuntu-latest)	4m 38s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 8s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 20s
build-windows-cpp-example	8m 51s
c-header	1m 13s
shellcheck	18s
rust-integration-test (windows-2019, directml)	6m 41s
rust-integration-test (macos-11)	3m 42s
rust-integration-test (ubuntu-20.04)	8m 23s
	1h 37m 37s

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