feat: remove webapi in favor of a smaller polyfill

[Princesseuh]

Changes

This PR removes the @astrojs/webapi package completely, instead replacing it with a very small polyfill. @astrojs/webapi used to be necessary, but Node has gotten pretty good over the years at supporting many of those APIs natively, and for the rest, we mainly provided no-op anyway.

Testing

Tests should still pass!

Docs

N/A

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Latest commit: 2af1b21

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[ematipico]

I believe we are not yet ready to delete the @astrojs/webapi package.

1. We have to make a major on npm;
2. We have to deprecate it in that major on npm, so people will get a notification when it's installed;

(BTW, I totally got the easter egg 🏴‍☠️ )

[Princesseuh]

I believe we are not yet ready to delete the @astrojs/webapi package.

1. We have to make a major on npm;
2. We have to deprecate it in that major on npm, so people will get a notification when it's installed;

(BTW, I totally got the easter egg 🏴‍☠️ )

This is to be merged in next, so we can do this whenever we'll actually release 3.0

[ematipico]

This is to be merged in next, so we can do this whenever we'll actually release 3.0

I hope you know how, because I wouldn't know how to do if the files don't exist anymore 🤣 (even in next branch)