`SynthesisEngine`と`InferenceCore`を解体する #2302

Job	Run time
actionlint	25s
build-and-test-java-api (windows-latest)	6m 0s
build-and-test-python-api (windows-latest)	5m 39s
build-and-test-java-api (macos-latest)	7m 39s
build-and-test-python-api (macos-latest)	4m 10s
build-and-test-java-api (ubuntu-latest)	3m 6s
build-and-test-python-api (ubuntu-latest)	2m 34s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	3m 13s
build-windows-cpp-example	3m 42s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 41s
c-header	50s
rust-lint	8m 3s
rust-integration-test-strategy-matrix	1s
rust-unit-test	10m 20s
shellcheck	9s
validate-cargo-lock	22s
rust-integration-test (windows-2019, directml)	6m 41s
rust-integration-test (macos-11)	2m 38s
rust-integration-test (ubuntu-20.04)	1m 4s
	1h 8m 17s

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