Add Github CI step and action for building with Gradle #5048

Job	Run time
Gradle build	1m 10s
Validate Dagger version	10s
Bazel tests	5m 3s
Bazel build	3m 21s
Artifact Java local tests	3m 40s
Test Hilt Gradle plugin	7m 59s
Artifact verification tests	10m 51s
Artifact Android local tests (AGP 8.1.1)	9m 35s
Artifact Android emulator tests (API ${{ matrix.api-level }})	0s
Build Hilt Gradle plugin against latest AGP version	0s
Publish snapshot	1s
Clean up GitHub Action caches	1s
	41m 51s

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