downloadクレートをdownloaderクレートに #2143

Job	Run time
actionlint	30s
build-and-test-java-api (windows-latest)	8m 56s
build-and-test-java-api (macos-latest)	3m 59s
build-and-test-java-api (ubuntu-latest)	6m 11s
build-and-test-python-api (windows-latest)	10m 21s
build-and-test-python-api (macos-latest)	7m 16s
build-and-test-python-api (ubuntu-latest)	4m 14s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	3m 53s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 32s
build-windows-cpp-example	6m 21s
c-header	1m 11s
rust-integration-test-strategy-matrix	3s
rust-lint	3m 59s
rust-unit-test	5m 12s
shellcheck	14s
validate-cargo-lock	27s
rust-integration-test (windows-2019, directml)	7m 21s
rust-integration-test (macos-11)	3m 11s
rust-integration-test (ubuntu-20.04)	1m 35s
	1h 17m 26s

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