Add new node asset scripts for geometry and shader operations

- Implemented `build_mesh_plane.py` to create a geometry node group for mesh planes with customizable parameters.
- Created `build_shadeless.py` for a shader node group that displays color without scene lighting while preserving shadows and reflections.
- Added `validate.py` to validate the integrity of the newly created node groups and their inputs.
- Introduced `validate_cutout.py` to ensure the functionality of cutout node groups and their dependencies.
- Developed `validate_mesh_plane.py` to test the mesh plane creation and its modifier settings.

src/anyimage/operators/debug.py

@@ -2,7 +2,7 @@ import bpy
 
 from ..runtime import JobOperatorBase
 from ..properties import BEN2_MODEL_KEY, REALESRGAN_GENERAL_WDN_MODEL_KEY
-from .common import (
+from .common.operator import (
     background_input_path,
     da3_parameters,
     input_path,