Summary:
This is a simple extension to gdb, which will print the LogicalOperator
tree. Auto loading of the extension is supported via .gdbinit if the gdb
is run from the root of the repository.
Explicit loading of scripts can be done inside gdb by running
`source path/to/extension.py`.
Reviewers: florijan, mislav.bradac, buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D428
