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

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
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  • Documentation not necessary because: it will automatically generated by docs component

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Latest commit: 4d43e39

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[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

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• packages/wrangler/src/tests/ai-search.test.ts: [@cloudflare/wrangler]
• packages/wrangler/src/ai-search/create.ts: [@cloudflare/wrangler]
• packages/wrangler/src/ai-search/types.ts: [@cloudflare/wrangler]

[devin-ai-integration]

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commit: 4d43e39

[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