Remove relative imports

Fix primary keys (optional)
Add baskets, importers, plugins, reactor
Add fake replacement fro graphql defs (to_migrate)
Add typing marker (py.typed)

src/gisaf/models/misc.py

@@ -4,8 +4,8 @@ from pydantic import ConfigDict
 
 from sqlmodel import Field, JSON, Column
 
-from .models_base import Model
-from .metadata import gisaf_map
+from gisaf.models.models_base import Model
+from gisaf.models.metadata import gisaf_map
 
 logger = logging.getLogger(__name__)
 
@@ -25,7 +25,7 @@ class Qml(Model):
         menu = 'Other'
         flask_admin_model_view = 'QmlModelView'
 
-    model_name: str = Field(default=None, primary_key=True)
+    model_name: str | None = Field(default=None, primary_key=True)
     qml: str
     attr: str
     style: str