Fix (unreported) Outliner missing updates copying IDs via python

Steps to reproduce:
- switch to Scripting workspace
- execute bpy.data.meshes['Cube'].copy()
- Outliner will not show the new mesh immediately

Now just send appropriate notifier.

Differential Revision: https://developer.blender.org/D10584

source/blender/makesrna/intern/rna_ID.c

@@ -528,6 +528,9 @@ static ID *rna_ID_copy(ID *id, Main *bmain)
   if (newid != NULL) {
     id_us_min(newid);
   }
+
+  WM_main_add_notifier(NC_ID | NA_ADDED, NULL);
+
   return newid;
 }