feat: create @zag-js/lit (WIP)

[nikparo]

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📝 Description

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WIP work on creating a @zag-js/lit framework. Adds packages/frameworks/lit and examples/lit-ts, and adapts e2e/ testing suite to optionally work with shadow-dom.

This PR is only open for visibility and comments, it's not ready to be merged.

NOTE: Video is from my dev/lit branch that combines several other branches, including: https://github.com/chakra-ui/zag/pull/2694 https://github.com/chakra-ui/zag/pull/2697 https://github.com/chakra-ui/zag/pull/2695

⛳️ Current behavior (updates)

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🚀 New behavior

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https://github.com/user-attachments/assets/47b59933-d663-4795-bdec-9b9f60c7d288

💣 Is this a breaking change (Yes/No):

📝 Additional Information

Related discussion threads: https://github.com/chakra-ui/zag/discussions/2681 https://github.com/chakra-ui/zag/discussions/1210

Thank you @gperdomor for your work on https://github.com/chakra-ui/zag/pull/2608