fix: add __all__ to package root for exports

Author: spwoodcock

geojson_aoi/__init__.py

@@ -1,5 +1,11 @@
 """The main geojson_aoi package."""
 
-from ._async.parser import parse_aoi_async as parse_aoi_async
-from ._sync.parser import parse_aoi as parse_aoi
-from .dbconfig import DbConfig as DbConfig
+from ._async.parser import parse_aoi_async
+from ._sync.parser import parse_aoi
+from .dbconfig import DbConfig
+
+__all__ = [
+    "parse_aoi_async",
+    "parse_aoi",
+    "DbConfig",
+]