expose toolBehavior and toolResponseScheduling

[simllll]

Description

simliar like it is already possible in the python lib: livekit/agents#3482
this exposes the toolBehavior and toolResponseScheduling parametre.

fixes #779

Pre-Review Checklist

• Build passes: All builds (lint, typecheck, tests) pass locally
• AI-generated code reviewed: Removed unnecessary comments and ensured code quality
• Changes explained: All changes are properly documented and justified above
• Scope appropriate: All changes relate to the PR title, or explanations provided for why they're included

Testing

• Automated tests added/updated (if applicable)
• All tests pass
• Make sure both restaurant_agent.ts and realtime_agent.ts work properly (for major changes)

Additional Notes

---

Note to reviewers: Please ensure the pre-review checklist is completed before starting your review.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9528955

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@livekit/agents-plugin-google	Minor

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[toubatbrian]

Add a small comment, others looks good! Could you record a loom video (or simply a video file) that showcase the changes will still make restaurant_agent.ts working normally (by swapping the llm to gemini RealtimeModel`?