feat(ai): add equals() to GenerativeBackend

[thatfiredev]

My use case may be niche: I want to apply different logic depending on whether the backend is Vertex AI or Google AI. Eg:

if (backend == GenerativeBackend.googleAI()) {
  // Perform certain logic
} else {
  // Perform some other logic
}

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[github-actions]

📝 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 (8e6f17f) and merge commit (f843e00).

Test Logs

• Base (8e6f17f): https://github.com/firebase/firebase-android-sdk/actions/runs/20279964877
• Merge (f843e00): https://github.com/firebase/firebase-android-sdk/actions/runs/20282842850

1. https://storage.googleapis.com/firebase-sdk-metric-reports/oauN1A89AO.html

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-ai

  Type	Base (8e6f17f)	Merge (f843e00)	Diff
  aar	1.11 MB	1.11 MB	+927 B (+0.1%)
  apk (aggressive)	1.71 MB	1.71 MB	+460 B (+0.0%)
  apk (release)	11.0 MB	11.0 MB	+536 B (+0.0%)

Test Logs

• Base (8e6f17f): https://github.com/firebase/firebase-android-sdk/actions/runs/20279964877
• Merge (f843e00): https://github.com/firebase/firebase-android-sdk/actions/runs/20282842850

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

[rlazo]

LGTM!

Make sure that, after syncing this branch with main, your changelog entry ends in the right section (unreleased).