Python playground support

[penalosa]

Fixes # [insert GH or internal issue number(s)].

What this PR solves / how to test:

Go to https://8f2e7cec.workers-playground.pages.dev/playground/python and you should be able to try it out! (the first time you visit you might get a "Valid token must be provided" error—just reload the page. Cookies are a bit funny in the preview deployments)

Author has addressed the following:

• Tests
  • [ ] Included
  • [x] Not necessary because: No tests have been added for the python functionality, since it's not yet stable enought to test realiably. There should be no affect on the JS functionality
• Changeset (Changeset guidelines)
  • [ ] Included
  • [x] Not necessary because: Not relevant
• Associated docs
  • [ ] Issue(s)/PR(s):
  • [x] Not necessary because: Not at a stage for docs

Note for PR author:

We want to celebrate and highlight awesome PR review! If you think this PR received a particularly high-caliber review, please assign it the label highlight pr review so future reviewers can take inspiration and learn from it.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 5be7125626743b18eb6fa0927999477ac433c857

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

This PR includes changesets to release 3 packages

Name	Type
playground-preview-worker	Patch
workers-playground	Patch
workers.new	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[bot]]

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/8191776021/npm-package-wrangler-5043

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5043/npm-package-wrangler-5043

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8191776021/npm-package-wrangler-5043 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8191776021/npm-package-create-cloudflare-5043 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8191776021/npm-package-cloudflare-kv-asset-handler-5043

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8191776021/npm-package-miniflare-5043

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8191776021/npm-package-cloudflare-pages-shared-5043

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8191776021/npm-package-cloudflare-vitest-pool-workers-5043

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

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240223.1
workerd	1.20240304.0	1.20240304.0
workerd --version	1.20240304.0	2024-03-04

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

[irvinebroque]

🙌 🔥

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.36%. Comparing base (2713977) to head (5be7125). Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5043   +/-   ##
=======================================
  Coverage   70.35%   70.36%           
=======================================
  Files         298      298           
  Lines       15567    15567           
  Branches     4007     4007           
=======================================
+ Hits        10952    10953    +1     
+ Misses       4615     4614    -1     

see 4 files with indirect coverage changes

[irvinebroque]

Should we merge so that can start playing with this in production, etc? And then layer on other options as discussed in designs in separate PR?