[Feature] Implement legacy endpoints to enable copy via python client (#400)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#400

epdb/models.py

@@ -4492,18 +4492,22 @@ class AdditionalInformation(models.Model):
 
         return f"{self.scenario.url}/additional-information/{self.uuid}"
 
-    def get(self) -> "EnviPyModel":
+    @staticmethod
+    def from_dict(ai_type: str, ai_data: Dict[str, Any]):
         from envipy_additional_information import registry
 
         MAPPING = {c.__name__: c for c in registry.list_models().values()}
         try:
-            inst = MAPPING[self.type](**self.data)
+            inst = MAPPING[ai_type](**ai_data)
         except Exception as e:
-            print(f"Error loading {self.type}: {e}")
+            print(f"Error loading {ai_type}: {e}")
             raise e
 
-        inst.__dict__["uuid"] = str(self.uuid)
+        return inst
 
+    def get(self) -> "EnviPyModel":
+        inst = AdditionalInformation.from_dict(self.type, self.data)
+        inst.__dict__["uuid"] = str(self.uuid)
         return inst
 
     def __str__(self) -> str: