GeomapPanel: Add base types to data layer options (#50053)

* GeomapPanel: Add base types to data layer options

Removed isBaseMap check from data layer filter, which used to remove
base layer types from data layer options. For layer editor, slider to
control opacity is added.

* GeomapPanel: Reorder data layer options

For data layer selection, present user with data layer types first,
before base map layer types. Refactored to consolidate layer options
into a single exported function in registry with a base map boolean.

* GeomapPanel: Add descriptions to base map types

* GeomapPanel: add hideOpacity and apply to markers

* GeomapPanel: update descriptions for map types

Closes #47812

packages/grafana-data/src/geo/layer.ts

@@ -104,9 +104,9 @@ export interface MapLayerRegistryItem<TConfig = MapLayerOptions> extends Registr
   showLocation?: boolean;
 
   /**
-   * Show transparency controls in UI (for non-basemaps)
+   * Hide transparency controls in UI
    */
-  showOpacity?: boolean;
+  hideOpacity?: boolean;
 
   /**
    * Function that configures transformation and returns a transformer