downloadクレートをdownloaderクレートに #2144

Job	Run time
actionlint	23s
rust-lint	2m 6s
shellcheck	21s
validate-cargo-lock	17s
build-and-test-java-api (windows-latest)	51s
build-and-test-java-api (macos-latest)	38s
build-and-test-java-api (ubuntu-latest)	26s
build-and-test-python-api (windows-latest)	1m 3s
build-and-test-python-api (macos-latest)	46s
build-and-test-python-api (ubuntu-latest)	41s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	24s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	19s
build-windows-cpp-example	43s
c-header	23s
rust-integration-test-strategy-matrix	2s
rust-unit-test	2m 51s
rust-integration-test (windows-2019, directml)	2m 34s
rust-integration-test (macos-11)	2m 41s
rust-integration-test (ubuntu-20.04)	36s
	18m 5s

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