The goal is to be able to reuse parts of this code in all the places that call
Geometry Nodes. Currently, that's only a modifier and an operator. More places
may follow in the future though.
This patch does not implement any of the code-reuse yet, it just extracts the
code into a separate file. Follow-up patches will work towards better
code-reuse.
Note, this extracts the entire modifier drawing, including error messages,
baking etc. I found this to be easier, because they still often share a common
core (like getting the logged data).
Pull Request: https://projects.blender.org/blender/blender/pulls/139379
26ce934148