Refactor and clean up codebase by removing unused functions and reorganizing imports

- Removed unused model keys and functions from properties.py.
- Deleted projection.py as its functions were no longer needed.
- Cleaned up model_catalog.py by removing unused model directory function.
- Updated imports in various test files to reflect new module structure.
- Removed deprecated test cases related to image editing tools.
- Added new tests for ONNX runtime provider selection logic.

src/anyimage/operators/convert_to_plane/__init__.py

@@ -1,6 +1,6 @@
 """Rectangular Plane and Depth Plane conversion operators."""
 
-from .conversion import (
+from .operators import (
     ConvertToDepthPlane,
     ConvertToPlane,
     GenerateDepthPlane,