Add Gremlint support for Gremlin magic

[bechbd]

Is your feature request related to a problem? Please describe.
With the recent release of TP3.5 the Gremlint library is now part of the project. It would be nice to integrate this into the notebook magic somehow to nicely format a Gremlin query.

https://groups.google.com/g/gremlin-users/c/3V9BslKP2Ts
https://github.com/apache/tinkerpop/tree/master/gremlint