feat(wrangler): add custom metadata to instance creation on ai search

[danielgek]

Fixes #RAG-1145.

Adds ability to specify custom metadata on instance creation on AI Search

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  • Documentation not necessary because: it will automatically generated by docs component

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[workers-devprod]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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commit: 578ef4c

[emily-shen]

can we let users provide a json file? or even only support a json file? this is a pretty common pattern across wrangler for setting secrets, configuring r2, kv etc.

so something like --custom-metadata-schema=schema.json

schema.json

{
title : text,
foo: number,
...
}

since CLI flags is quite unwieldy once you get past one or two.

[danielgek]

@emily-shen added and option to add as metadata as json, left the interactive one because, most of the use we have seen on this is with 2 or 3 fields

[emily-shen]

approving to unblock you, pending the previous comments being addressed

[workers-devprod]

Codeowners reviews satisfied

[danielgek]

@emily-shen addressed all the comments!

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