feat(@astro/cloudflare): improve DX for runtime typing

[alexanderniebuhr]

Changes

• allow users to add env types using a generic, improving DX

Testing

❌

Docs

❌

[changeset-bot]

🦋 Changeset detected

Latest commit: 63b8881

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

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[sarah11918]

This looks good to me on behalf of docs!

Make a note of the date: this is the rare time I'm going to wonder whether there is too much in the changeset, compared to the actual change in usage and documentation. 😅

I would be tempted to say that just the line describing the change is enough, without the code snippet. (It's a minor change from existing README documentation, and the examples are clear there on how to type.)

But, I leave the final decision to Platform!

[alexanderniebuhr]

I think I agree with @sarah11918 here.
This is also a patch change, so the smaller changeset should be fine. :)