feat: add set_manager

b.c. pydantic does not allow defining custom property setter
via a property decorator

python/lib/core/dmod/core/dataset.py

@@ -168,14 +168,7 @@ def _serialize_datetime(self: "Dataset", value: Optional[datetime]) -> Optional[
 
     def __init__(self, manager: DatasetManager = None, **kwargs):
         super().__init__(**kwargs)
-
-        self._manager = manager if isinstance(manager, DatasetManager) else None
-
-        if manager is not None:
-            # pydantic will not validate this, so we need to check it
-            if not isinstance(manager.uuid, UUID):
-                raise ValueError(f"Expected UUID got {type(manager.uuid)}")
-            self.manager_uuid = manager.uuid
+        self.set_manager(manager)
 
     def __eq__(self, other):
         now = datetime.now()
@@ -211,8 +204,16 @@ def manager(self) -> Optional[DatasetManager]:
         """
         return self._manager
 
-    @manager.setter
-    def manager(self, value: DatasetManager = None):
+    def set_manager(self, value: Union[DatasetManager, None]):
+        """
+        Sets the ::class:`DatasetManager` and updates the
+        ::attribute:`manager_uuid` property on this instances.
+
+        Parameters
+        ----------
+        value: DatasetManager | None
+            The new value for ::attribute:`manager`.
+        """
         self._manager = value if isinstance(value, DatasetManager) else None
 
         if value is not None: