Java API：Android版の設計を色々修正 #2038

Job	Run time
actionlint	19s
shellcheck	16s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 29s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 24s
c-header	1m 41s
rust-integration-test-strategy-matrix	1s
rust-lint	1m 29s
rust-unit-test	5m 22s
validate-cargo-lock	30s
build-and-test-java-api (windows-latest)	7m 16s
build-and-test-java-api (macos-latest)	5m 44s
build-and-test-python-api (windows-latest)	10m 33s
build-and-test-java-api (ubuntu-latest)	4m 11s
build-and-test-python-api (macos-latest)	6m 11s
build-and-test-python-api (ubuntu-latest)	5m 25s
build-windows-cpp-example	6m 14s
rust-integration-test (windows-2019, directml)	4m 7s
rust-integration-test (macos-11)	2m 42s
rust-integration-test (ubuntu-20.04)	1m 29s
	1h 11m 23s

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