Rebase #938 (pmtiles) onto main

[WebFreak001]

supersedes #938, close #938, close #807

also fixes the bug mentioned by @bdon (see 2nd commit)

There is a UI issue right now where the pmtiles:// prefix sometimes appears in the modal data sources editor, sometime does not. Ideally the pmtiles:// prefix is totally hidden from the editor, letting you naturally input a HTTP or HTTPS URL of a .pmtiles archive, and the internal Style JSON state has the full pmtiles://https://... string. This requires some changes to the existing patches, PR welcome.

cc @nyurik

[nyurik]

this looks good to me. I'll let others to chime in, and merge a bit later unless something serious is discovered

[HarelM]

This looks good, it would be better to have a test to cover the opening of this screen/flow.

[bdon]

What I was referring to above:

Where once a source is created, the pmtiles:// prefix shows up. Though it may make more sense this way since it maps directly to how a developer would specify it in the Style JSON. So not an essential change.

[WebFreak001]

I think it's good with pmtiles://, since this is also what you'll need to have in the final actual json - I just tested this with actually making a style and it worked very well and the protocol prefix helped me not forget it 👍

[WebFreak001]

rebase & improvements done in #938 now