Create find metadata file script

[2lu3]

Implement the 3_find_metadata_file.py script and its prerequisite workflow files to locate image metadata.

This PR introduces the initial three steps of the photo metadata restoration workflow. 1_copy_files.py copies image files and creates a pair.json mapping. 2_filter_missing_metadata.py analyzes existing EXIF metadata in the copied images. Finally, 3_find_metadata_file.py searches for associated external metadata files (e.g., .json files) based on the original image paths, preparing for a comprehensive metadata restoration. pyproject.toml is also added for project setup and dependency management.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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