add OpenAI Responses plugin

[tinalenguyen]

Description

implements openai responses API plugin

to use:
llm: new openai.responses.LLM(),

[changeset-bot]

🦋 Changeset detected

Latest commit: 0fb4ec2

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

This PR includes changesets to release 20 packages

Name	Type
@livekit/agents-plugin-openai	Patch
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-xai	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch

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[toubatbrian]

@tinalenguyen whenever you’re ready, could you take a look at the comments above?

[toubatbrian]

LGTM!