added inworld TTS plugin and example

[cshape]

Description

Adds a plugin for Inworld TTS as well as an example (inworld_tts.ts). There already is an Inworld TTS plugin for Python.

Changes Made

• Added inworld plugin folder and plugin code
• Note: extended tts.TTS event emitter to include timestamps (see example)
• Added inworld_tts.ts example file
• Updated pnpm-lock.yaml to include Inworld

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

• Make sure both restaurant_agent.ts and realtime_agent.ts work properly (for major changes)
• Tested Inworld in inworld_tts.ts using agents playground

Additional Notes

Existing Inworld Python plugin here.

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Latest commit: 687075c

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