Add cross-process support to local explorer

[emily-shen]

Would recommend reviewing by commit!

This lets you view all resources that are bound to any running worker, even if in a different miniflare process

• uses the dev registry to detect any other running process, regardless of whether there are service bindings between processes
• Supporting pagination while aggregating across resources gets really messy, so I've decided to drop pagination for listing resources. This seems fine because its unlikely someone's going to have enough bindings to make pagination needed.

404 responses now have accurate error codes (based on the actual CF API)

TODO (in a followup): show in the UI which workers are running, and what persistence directory the resource is using

See below for how aggregated listing works:

For operations on specific resources, (e.g. KV key put), we look for the namespace locally first then search others.

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: wip experimental thing

A picture of a cute animal (not mandatory, but encouraged)

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Latest commit: 8da11f7

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commit: 0aa7ce6

[github-actions]

✅ All changesets look good

[petebacondarwin]

LGTM - I left a bunch of comments but none blocking. I think Devin still has a few outstanding issues to address though.

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