downloadクレートをdownloaderクレートに #2145

Job	Run time
actionlint	24s
build-and-test-python-api (windows-latest)	1m 28s
build-and-test-python-api (macos-latest)	50s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	25s
build-and-test-python-api (ubuntu-latest)	33s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	20s
build-windows-cpp-example	48s
c-header	26s
rust-integration-test-strategy-matrix	7s
rust-lint	1m 33s
shellcheck	17s
validate-cargo-lock	22s
rust-unit-test	2m 41s
build-and-test-java-api (windows-latest)	53s
build-and-test-java-api (macos-latest)	50s
build-and-test-java-api (ubuntu-latest)	29s
rust-integration-test (windows-2019, directml)	1m 42s
rust-integration-test (macos-11)	4m 31s
rust-integration-test (ubuntu-20.04)	37s
	19m 16s

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