Add globe support in Maputnik UI (#1379)

## Launch Checklist

Add a small drop down to select mercator or globe.
This isn't a fully covered field as one can set an expression there, but
I believe this is good enough for most cases.

Before:
<img width="645" height="254" alt="image"
src="https://github.com/user-attachments/assets/19a7ec50-a0bb-4ea3-b9fc-3abc5572c47e"
/>
After:
<img width="770" height="462" alt="image"
src="https://github.com/user-attachments/assets/f4774020-1cc8-45fe-88f9-f77ad7c53140"
/>


 - [x] Briefly describe the changes in this PR.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
 - [x] Write tests for all new functionality.
 - [x] Add an entry to `CHANGELOG.md` under the `## main` section.

---------

Co-authored-by: Birk Skyum <birk.skyum@pm.me>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -5,6 +5,7 @@
 - Add support for hillshade's color arrays and relief-color elevation expression
 - Change layers icons to make them a bit more distinct
 - Remove `@mdi` packages in favor of `react-icons`
+- Add ability to control the projection of the map - either globe or mercator
 - Add markdown support for doc related to the style-spec fields
 - Added global state modal to allow editing the global state
 - _...Add new stuff here..._