feat: Added plugins/assemblyai

[josiahbryan]

Integrates AssemblyAI streaming speech-to-text using their official SDK

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Latest commit: 3c257af

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[CLAassistant]

All committers have signed the CLA.

[nbsp]

left some comments, also run pnpm install to update the lockfile

additionally please read CONTRIBUTING.md and fix any things we've listed there (linting, rebasing against next, etc)

[josiahbryan]

Due to the desire to merge to next and this PR points to livekit:main, I'll close this PR and open one against next 👍 (And fix the logger in the other PR, remove CHANGELOG, add the API key env var to turbo.json, etc)