feat: add bulk gets for kv in miniflare

[teresalves]

Fixes KV-1435
Adding new feature for bulk gets in miniflare.
It has already been added in workerd.

We are injecting a timestamp when we read/write our keys. So key1 becomes 1742848988250_122630884213439key1. This never influenced our tests because we never got the key back, and since the keys always matched in the write and read, it didn't matter. Now we had to clean that up when returning it back to the test result.

CR-1140001

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• Wrangler E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: We are just adding a new component in miniflare.
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: The docs will be done separately. (2025-04-07 update: these have now been added: KV: add bulk gets documentation cloudflare-docs#21392)
• Wrangler V3 Backport
  • TODO (before merge)
  • Wrangler PR:
  • Not necessary because: adds new feature

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cloudflare-workers-bindings-extension:

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miniflare:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/14108117783/npm-package-miniflare-8623

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---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	4.20250321.0
workerd	1.20250321.0	1.20250321.0
workerd --version	1.20250321.0	2025-03-21

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[penalosa]

@teresalves this will need to rebase on main to pull in the latest workerd

[CarmenPopoviciu]

could we please get a KV approval on this PR 🙏 ?

[rts-rob]

Approving as is; we will do a fast follow to tighten up some documentation.

[CarmenPopoviciu]

great work on this 🚀