fsdiff: implement `use_magic: bool` and `_guess_file_type()` in `FileTypeDetector`

[bmr-cymru]

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🔗 Similar Issues

Possible Duplicates

• fsdiff: implement "best guess" file type info when !options.include_file_type #793

Related Issues

• fsdiff: implement best-effort file type detection and "always exclude" paths #801
• fsdiff: add patterns for file type identification to snapm.fsdiff.filetypes #802

👤 Suggested Assignees

• bmr-cymru

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