Add workers ai staging flag

[G4brym]

What this PR solves / how to test

This adds support for staging flag for Ai binding, this binding only works in specific workers.
For normal users trying to use it, the flag will be ignored.

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
  • Not necessary because: internal tool
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/...
  • Not necessary because: internal tool

[changeset-bot]

🦋 Changeset detected

Latest commit: 0e5133e

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-wrangler-5705

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5705/npm-package-wrangler-5705

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-wrangler-5705 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-create-cloudflare-5705 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-cloudflare-kv-asset-handler-5705

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-miniflare-5705

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-cloudflare-pages-shared-5705

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8861024255/npm-package-cloudflare-vitest-pool-workers-5705

Note that these links will no longer work once the GitHub Actions artifact expires.

---

wrangler@3.52.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240419.0
workerd	1.20240419.0	1.20240419.0
workerd --version	1.20240419.0	2024-04-19

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

[RamIdeas]

Do we want to mark this with a JSDoc @internal attribute or some other way to clarify to external users that they shouldn't use this?

[RamIdeas]

We already have first_party_worker, logfwdr and unsafe bindings so no need to block this PR now. We can follow up later if this is applicable.

[G4brym]

The builds have now passed successfully, and we have tested this locally and is working, can you @RamIdeas merge this pr?