fsdiff: implement "best guess" file type info when `!options.include_file_type`

[bmr-cymru]

Implement some file type identification heuristics based on:

• Text file extensions, text file paths
• Binary file extensions, binary file paths
• Final catch-all "unknown" (treat as potential binary)

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🔗 Similar Issues

Possible Duplicates

• fsdiff: large diff without -f | --file-types considered harmful #792

Related Issues

• fsdiff: implement best-effort content diffs without magic #681
• fsdiff: add FsDiffResults.type_changed #753

👤 Suggested Assignees

• bmr-cymru

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[bmr-cymru]

Resolved in #810.