Standardize LanguageCode handling

[toubatbrian]

Ported from livekit/agents#4926 and livekit/agents#4981

[changeset-bot]

🦋 Changeset detected

Latest commit: d0cccb4

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

This PR includes changesets to release 21 packages

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

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[davidzhao]

lg!