feat(node_assets): add image plane geometry nodes and validation scripts

- Implemented `image_plane.py` to build the Image Plane Geometry Nodes group with customizable parameters for geometry, subdivide, and thickness.
- Created `image_plane_validation.py` to validate the functionality of the image plane, ensuring correct geometry generation and material assignment.
- Developed `material_layers.py` to construct shader node groups for image materials, including depth and normal handling.
- Authored `plane_layouts.py` to define node arrangements for image geometry assets.
- Introduced `shadeless.py` to create a shadeless shader node group that displays color without scene lighting while preserving shadows and reflections.

src/anyimage/operators/__init__.py

@@ -3,7 +3,6 @@ from .cutout_tool import (
     CutoutSelectionToShape,
     SelectCutoutSelection,
 )
-from .debug import DebugBen2, DebugDa3, DebugMoge2, DebugUpscale
 from .image_edit_tool import CLASSES as IMAGE_EDIT_TOOL_CLASSES
 from .convert_to_plane import (
     ConvertToDepthPlane,
@@ -25,10 +24,6 @@ CLASSES = (
     OpenAIEnvironmentSettings,
     DownloadModel,
     DownloadRequiredModels,
-    DebugDa3,
-    DebugMoge2,
-    DebugBen2,
-    DebugUpscale,
     GenerateDepthPlane,
     CutoutSelectionToShape,
     SelectCutoutSelection,