Add LocationIQ as supported map provider (#1293)

- Add LocationIQ access token field to settings and export modals
  - Include LocationIQ Streets style in gallery
  - Support automatic token replacement for LocationIQ URLs
  - Add LocationIQ tileset configuration
  - Include translations for all supported languages

## Launch Checklist
 - [x] Briefly describe the changes in this PR.
 - [x] Write tests for all new functionality.
 - [x] Add an entry to `CHANGELOG.md` under the `## main` section.

src/config/styles.json

@@ -29,6 +29,12 @@
     "url": "https://cdn.jsdelivr.net/gh/openmaptiles/dark-matter-gl-style@v1.9/style.json",
     "thumbnail": "https://maputnik.github.io/thumbnails/dark-matter.png"
   },
+  {
+    "id": "locationiq-streets",
+    "title": "LocationIQ Streets",
+    "url": "https://tiles.locationiq.com/v3/streets/vector.json?key={key}",
+    "thumbnail": "https://static-assets.locationiq.com/maputnik/locationiq-streets.png"
+  },
   {
     "id": "maptiler-basic-gl-style",
     "title": "MapTiler Basic",