feat: add ConstraintType to GraphSchema for constraint extraction

Author: Amir Layegh

src/neo4j_graphrag/generation/prompts.py

@@ -235,15 +235,15 @@ class SchemaExtractionTemplate(PromptTemplate):
         {{
           "name": "name",
           "type": "STRING"
-        }},
+        }}
       ]
-    }},
+    }}
     ...
   ],
   "relationship_types": [
     {{
       "label": "WORKS_FOR"
-    }},
+    }}
     ...
   ],
   "patterns": [
@@ -255,7 +255,7 @@ class SchemaExtractionTemplate(PromptTemplate):
       "type": "UNIQUENESS",
       "node_type": "Person",
       "property_name": "person_id"
-    }},
+    }}
     ...
   ]
 }}