oxen workspace list displays file change count

[malcolmgreaves]

Adds a status column to the output of oxen workspace list.
This column lists the file change summary for each workspace.

The format is +, ~, and - for files added, changed, and removed, respectively.
If the workspace has no changes, then the world clean is displayed instead.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch mg/workspacelistfilestatus

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