Implement map api (ex. /v2/map/init-data)

Migrate registry.primary_groups to pydantic model

src/gisaf/models/store.py

@@ -9,7 +9,7 @@ class MapLibreStyle(BaseModel):
 class Store(BaseModel):
     auto_import: bool
     # base_gis_type: str
-    count: int
+    count: int | None = None
     custom: bool
     description: str
     #extra: dict[str, Any] | None