fix resource cleanup

[simllll]

Description

adds close hooks for tts,sst and vad.
also fixes the deepgram STT implementation, the additional aborthandler in this case is a safety net (e.g. when resetWS was called).
This change is required for #837 (TTS), but also for #829 (STT) to cleanup the websocket on session end.
also this PR is not cleaning up everything, it's just a small start ;)

Changes Made

• implements close() hooks for tts,sst and vad like in python (aclose)
• deepgram STT resource cleanup

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
• Video demo: A small video demo showing changes works as expected and did not break any existing functionality using Agent Playground (if applicable)

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

see also #837 (comment)

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

[changeset-bot]

🦋 Changeset detected

Latest commit: 7d966e8

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

This PR includes changesets to release 14 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch

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[toubatbrian]

Hey @simllll, have you tested this change locally?

[simllll]

Yes, tested and working. There is one "cosmetic" thing I foud in deepgram, give me some minutes, I will add the latest version.

Regarding resource cleanup in general:
Also this one is quite relevant livekit/node-sdks#575