[WIP] Update code base to support S3 paths using Pyfs

[Copilot]

• Add PyFilesystem dependencies (fs, fs.s3fs) to requirements.txt and setup.py
• Create fs_utils.py module to provide filesystem abstraction layer
• Update validation.py to use filesystem abstraction for directory/file operations
• Update es_utils.py to use filesystem abstraction for reading files
• Update bdrc_etext_sync.py to use filesystem abstraction for OCFL operations
• Test changes with local paths to ensure backward compatibility
• Document S3 path format (s3://bucket/prefix/path)

Original prompt

please make it so the code base works with s3 paths, not just local paths. Pyfs looks like a good options for this

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