This adds endpoints to list DO namespaces and DO objects. Querying DO sqlite will be more complex, so it'll come in its own PR.

1. list namespaces - this follows the pattern of the other resources and gets the namespaces from the available bindings. we want to list only internal DOs and unbound ones, but not external DOs.
2. list objects - this uses the node loopback to read the persistence directory and get the DO object ids. We cant go from id -> name so unfortunately we will not be able to list by name (if a DO was created with idFromName or getByName. We can go from name -> id and search for matching ids though, so we can add a search to the UI as a workaround.

• 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

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