Java API：Android版の設計を色々修正 #2035

Job	Run time
actionlint	20s
validate-cargo-lock	28s
rust-lint	2m 35s
build-and-test-java-api (windows-latest)	10m 18s
build-and-test-python-api (windows-latest)	12m 57s
build-and-test-java-api (macos-latest)	5m 14s
build-and-test-python-api (macos-latest)	8m 8s
build-and-test-java-api (ubuntu-latest)	3m 27s
build-and-test-python-api (ubuntu-latest)	4m 14s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	3m 39s
build-windows-cpp-example	7m 59s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 28s
c-header	1m 8s
rust-integration-test-strategy-matrix	1s
rust-unit-test	6m 27s
shellcheck	20s
rust-integration-test (windows-2019, directml)	6m 45s
rust-integration-test (macos-11)	2m 27s
rust-integration-test (ubuntu-20.04)	1m 32s
	1h 20m 27s

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