feat: openCV resizing

[anna-singleton-resolver]

No description provided.

[Copilot]

Pull request overview

This PR migrates the image processing library from PIL/Pillow to OpenCV (cv2), eliminating the dependency on PIL and ImageMagick while maintaining the same image generation and resizing functionality.

Changes:

• Replaced PIL/Pillow with OpenCV for all image encoding, decoding, and resizing operations
• Removed ImageMagick dependency from functional tests by using OpenCV's native format conversion
• Updated image generation utilities to use numpy arrays and OpenCV encoding

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyproject.toml	Replaced pillow dependency with opencv-python-headless
src/resolver_athena_client/client/transformers/core.py	Migrated image resizing logic from PIL to OpenCV with new resampling algorithm enum
src/resolver_athena_client/client/athena_options.py	Updated resampling algorithm type from PIL.Image.Resampling to OpenCVResamplingAlgorithm
src/resolver_athena_client/image_generation.py	Converted image generation from PIL to OpenCV using numpy arrays
tests/utils/image_generation.py	Deleted original image generation utilities (moved to src)
tests/functional/conftest.py	Replaced ImageMagick-based format conversion with OpenCV encoding
tests/test_classify_single.py	Updated test image creation to use OpenCV instead of PIL
tests/client/transformers/test_core.py	Migrated test image creation from PIL to OpenCV
tests/client/transformers/test_hash_pipeline.py	Updated test image generation to use OpenCV
tests/functional/test_invalid_image.py	Changed expected exception from PIL's UnidentifiedImageError to ValueError
Multiple test files	Updated imports to use new image_generation module location
docs/api/transformers.rst	Updated documentation to reflect OpenCV resampling algorithm
README.md	Removed ImageMagick installation requirement

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[iwillspeak]

LGTM. 🚀