Java API：Android版の設計を色々修正 #2031

Job	Run time
actionlint	22s
rust-lint	2m 58s
rust-unit-test	5m 54s
shellcheck	17s
validate-cargo-lock	38s
build-and-test-java-api (windows-latest)	10m 8s
build-and-test-java-api (macos-latest)	7m 6s
build-and-test-java-api (ubuntu-latest)	3m 56s
build-and-test-python-api (windows-latest)	13m 11s
build-and-test-python-api (macos-latest)	8m 50s
build-and-test-python-api (ubuntu-latest)	4m 11s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 29s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 35s
build-windows-cpp-example	9m 15s
c-header	1m 35s
rust-integration-test-strategy-matrix	2s
rust-integration-test (windows-2019, directml)	5m 10s
rust-integration-test (macos-11)	3m 31s
rust-integration-test (ubuntu-20.04)	1m 28s
	1h 25m 36s

Provide feedback