feat: WPT runner

[KhafraDev]

Implements a very basic WPT runner that should allow every test to run (theoretically - this PR only enables a single test to ensure that the runner is working).

The implementation is taken from https://github.com/KhafraDev/node-xmlhttprequest/tree/main/tests with some minor adjustments (setting exitCode on test failure, exiting if there are no tests to run).

Pros:

1. Uses the WPT test harness, unlike node's builtin wpt runner. See https://github.com/nodejs/node/blob/098eac7f272f5e720c9aff8b232501928a88b82a/test/common/wpt.js#L12-L14.
2. Each test runs in its own context, and the tests are run in a Worker. The environment these tests run in should be identical to an actual node.js runtime, so hopefully there won't be any unexpected jest-like issues.
3. Has a built-in server that allows serving resources for tests and enabling a very basic routing system. Note that the server runs in its own process (using child_process.fork) and communicates via ipc. This is because the xhr tests (from my package mentioned above) test synchronous requests that would block the thread and cause requests to never complete. This workaround probably isn't needed here but I decided not to make many changes.

Cons

1. Uses esm because of personal preference. Also makes use of top level await and other esm-only things, however it could be re-written to use cjs.
2. Probably only works on node v18 or above; hasn't been tested in v16.
3. Doesn't log test completions; only test failures. Currently there isn't a way to enable flaky tests or expected test failures either.

[codecov-commenter]

Codecov Report

Base: 94.89% // Head: 94.89% // No change to project coverage 👍

Coverage data is based on head (4cefdc8) compared to base (e5e5b97).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1662   +/-   ##
=======================================
  Coverage   94.89%   94.89%           
=======================================
  Files          53       53           
  Lines        4803     4803           
=======================================
  Hits         4558     4558           
  Misses        245      245           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[ronag]

Nice!

[mcollina]

Can you add it to CI?

[KhafraDev]

added to the CI

[mcollina]

lgtm