Subpath exports in web package

[mimarz]

Description

We have gotten an end-user request for being able to import specific parts of the web package.

for example; @digdir/designsystemet-web/popover

Make use of subpath exports and document recommended way is still to import all.

Maybe we will have to make a separate base/init export for globals.

Additional Information

No response

[Barsnes]

This means we also need separate typefiles for each file we mark as an export. Will muck our dist folder a bit, but I think thats fine.