feat: New test package

[Fryuni]

This new package is essentially the test-utils, the test adapter, and the node module validation plugin from the Astro core repo, but with the following modifications:

• Remove any reference to internals so it works outside the mono repo without relying on the package installation paths
• Make everything properly typed so TS is happy (and fix some bugs that were not being caught because it was not typed)
• Remove some pieces that are only relevant to test internal Astro behavior (by causing specific internal states)
• Make the plugin check for any node module instead of a shortlist
• Wrap some too permissive and dangerous APIs (because they are meant to be internal) in more user-friendly wrappers
• Add documentation to all the exposed APIs for testing
• Make it test-framework agnostic. Works Vitest, Node tests, Playwright, ...
• Make paths relative to the test using the utility and not to the utility itself (since it is now a dependency and not part of the project)

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Name	Status	Preview	Updated (UTC)
inox-tools	✅ Ready (Inspect)	Visit Preview	Sep 10, 2024 2:19am

[florian-lefebvre]

Haven't reviewed the PR but I think there's work done by Alex to have astro/test-utils. I'm afraid this package would be made useless by his work. Let's double check first!

[Fryuni]

There is ongoing conversation about having this in the Astro core repo to be published under @astrojs/.

I'll still need this to test existing and future Inox Tools packages until that lands on Astro. If/when that happens, this package can be deprecated.

[dreyfus92]

This is amazing, I left a couple of suggestions to improve clarity. Let me know what you think 😁

[Fryuni]

I will merge this to proceed with testing everything on Inox Tools. We can always come back to it as others develop opinions about it.