Unify new GraphNode grid to ensure connections are always aligned to the grid

[Shadowblitz16]

Describe the project you are working on

I am messing around with godot orchestrator

Describe the problem or limitation you are having in your project

It seems the node graph control grid is not unified with the window size and the spacing of inputs and outputs

here is the link the the issue I made on the orchestrator repo
CraterCrash/godot-orchestrator#779

Describe the feature / enhancement and how it helps to overcome the problem or limitation

Force windows and input and output nodes to be based on some default grid size.
This ensures the nodes and their lines can always be aligned.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

see above.

I would suggest a default grid size of 8

If this enhancement will not be used often, can it be worked around with a few lines of script?

According to the orchestrator plugin dev it's a limitation of the node graph

Is there a reason why this should be core and not an add-on in the asset library?

It makes it look nicer