chore: add tests to runtime

[Nemikolh]

This PR adds tests to the @tutorialkit/runtime package and add an helper package, webcontainer-api-mock to help testing code that uses the WebContainer API.

It's minimal at this point but the idea is that it will grow to support @tutorialkit/components-react over time.

I'm also planning to add more tests for the runtime but I wanted to open the PR to start getting feedback on the approach taken with the webcontainer-api-mock package.

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[SamVerschueren]

Some small comments, but looks very good!

[SamVerschueren]

Just a small comment, other than that, really love the fact that we have much more tests!

[SamVerschueren]

Shouldn't .astro files be gitignored?

[Nemikolh]

The .astro folder is ignored already, I noticed that prettier was giving a warning locally because it doesn't ignore it.

It doesn't produce that warning on CI because we run prettier before running the build script. If the order was reversed, the CI would fail which would be a bit silly.

[SamVerschueren]

OOh weird. Ok, then it's fine.

[SamVerschueren]

Very nice! Just two very small questions/remarks.

[SamVerschueren]

Awesome work @Nemikolh 🙏 !