Add tools and tests for AnyImage model management and documentation

- Implement sync_models.py for preparing and uploading ONNX artifacts.
- Create build_node.py for building and validating Blender scripts.
- Add docs.py for building and previewing documentation with Mike or MkDocs.
- Introduce model_exports.py for exporting PyTorch models to ONNX format.
- Develop pack.py for packaging the project with dependencies for different platforms.
- Add test_sync_models.py to validate sync_models functionality.
- Add test_tool_commands.py to ensure repository tools have correct command scripts.
- Initialize tools package with __init__.py.

tools/node_assets/build_material_layers.py

@@ -2,7 +2,7 @@
 
 import bpy
 
-from anyimage.operators.common.mesh_result import (
+from anyimage.common.object import (
     DEPTH_MATERIAL_NODE_GROUP_NAME,
     IMAGE_MATERIAL_NODE_GROUP_NAME,
 )