Allow passing includeNegativeCycles to v2/pathfinding.singleSource.bellmanFord

Author: FlorentinD

procedures/facade-api/configs/path-finding-configs/src/main/java/org/neo4j/gds/paths/bellmanford/AllShortestPathsBellmanFordWriteConfig.java

@@ -27,6 +27,9 @@
 @Configuration
 public interface AllShortestPathsBellmanFordWriteConfig extends AllShortestPathsBellmanFordBaseConfig, WriteRelationshipConfig, WritePathOptionsConfig {
 
+    String WRITE_NEGATIVE_CYCLES_KEY = "writeNegativeCycles";
+
+    @Configuration.Key(WRITE_NEGATIVE_CYCLES_KEY)
     default boolean writeNegativeCycles() {
         return false;
     }