feat: add ImageConfig and new FinishReasons for image generation

[thatfiredev]

[github-actions[bot]]

📝 PRs merging into main branch

Our main branch should always be in a releasable state. If you are working on a larger change, or if you don't want this change to see the light of the day just yet, consider using a feature branch first, and only merge into the main branch when the code complete and ready to be released.

[google-oss-bot]

Coverage Report ¹

Affected Products

No changes between base commit (bc2bc5c) and merge commit (b48477b).

Test Logs

• Base (bc2bc5c): https://github.com/firebase/firebase-android-sdk/actions/runs/20243628313
• Merge (b48477b): https://github.com/firebase/firebase-android-sdk/actions/runs/20278670112

1. https://storage.googleapis.com/firebase-sdk-metric-reports/xIstAiFRfo.html

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-ai

  Type	Base (bc2bc5c)	Merge (b48477b)	Diff
  aar	1.11 MB	1.12 MB	+12.6 kB (+1.1%)
  apk (aggressive)	1.71 MB	1.72 MB	+5.93 kB (+0.3%)
  apk (release)	11.0 MB	11.0 MB	+9.08 kB (+0.1%)

Test Logs

• Base (bc2bc5c): https://github.com/firebase/firebase-android-sdk/actions/runs/20243628313
• Merge (b48477b): https://github.com/firebase/firebase-android-sdk/actions/runs/20278670112

1. https://storage.googleapis.com/firebase-sdk-metric-reports/2NcT2lkjxa.html

[google-oss-bot]

The public api surface has changed for the subproject firebase-ai: error: Removed field com.google.firebase.ai.type.FinishReason.IMAGE_OTHER [RemovedField] error: Removed field com.google.firebase.ai.type.FinishReason.IMAGE_RECITATION [RemovedField]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.

[google-oss-bot]

The public api surface has changed for the subproject firebase-ai: error: Added field com.google.firebase.ai.type.FinishReason.IMAGE_OTHER [AddedField] error: Added field com.google.firebase.ai.type.FinishReason.IMAGE_RECITATION [AddedField]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.