R2-3560: Implement listParts and listMultipartUploads for R2 Miniflare Backend

[helloimalastair]

Must be released right after cloudflare/workerd#5596

---

• Tests
  • Tests included/updated
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s): R2-3560: Document listParts and listMultipartUploads on the Workers Binding cloudflare-docs#26996
  • Documentation not necessary because:
• Wrangler V3 Backport
  • Not sure on this one
  • Wrangler PR:
  • Not necessary because:

[changeset-bot]

🦋 Changeset detected

Latest commit: 5d3cf5e

The changes in this PR will be included in the next version bump.

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commit: 5d3cf5e