[REQUEST] Graph Schema Refactoring (Adjacency Migrations)

[zprobst]

There are a variety of migrations that change the topology of the graph instead of just the data types themselves. The APOC docs have a whole section of possible refactorings that would be nice to support. However. some of the most relevant ones are:

1. Redirect Relationship - Point a relationship from one node to the next.
2. Invert Relationship - Change the direction of a relationship. Often paired with a name change.
3. Extract Node From Relationship - Extract an Intermediary node between two previously related nodes.