Create a Globalized Type

[Bashamega]

This PR introduces a reusable generic utility type, Globalized, to model environments where a scoped global (such as WorkerGlobalScope) is augmented with globalThis.
This will allow us to use type instead of override type when using it in KDL or JSONc

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @saschanaz - if they write a comment saying "LGTM" then it will be merged.

[jakebailey]

I don't think we should just be adding random global types like this that aren't from a spec; this seems like it's just the same code but not inlined?

[Bashamega]

We already created a similar type in #2338 for SelectionDirection

[jakebailey]

That's totally different,no?

[Bashamega]

That's totally different,no?

I think no, I think this is just using the DRY method like that pr

[saschanaz]

Adding string enum is OK-ish as users may want to use the same definition without repeating, but in this case it's unlikely that users would ever do this manually.

[Bashamega]

Understood @saschanaz

[saschanaz]

(also the spec would use string enum if it was added in 2025; it does not because it's added back in the old days when it wasn't using Web IDL and doing so now would cause potential webcompat issue because of order of exception)