Add maven publish plugin to Gradle projects. #5066

Job	Run time
Gradle build	1m 30s
Validate Dagger version	14s
Bazel build	3m 45s
Bazel tests	6m 59s
Artifact verification tests	13m 5s
Test Hilt Gradle plugin	8m 35s
Artifact Android local tests (AGP 8.1.1)	12m 50s
Artifact Java local tests	3m 51s
Artifact Android emulator tests (API ${{ matrix.api-level }})	0s
Build Hilt Gradle plugin against latest AGP version	0s
Clean up GitHub Action caches	8s
Publish snapshot	0s
	50m 57s

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