Update stats command distribution graph

[kyle-rader]

Refactor stats command to show only the author distribution graph with dot bars and add a --top option to limit contributors.

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Note

Adds --top to lk stats to limit contributors and updates output to a dot-based author distribution graph only; bumps version to 0.10.1.

• Stats (src/main.rs)
  • New option: --top <N> to limit displayed contributors; validates N > 0.
  • Output change:
    • Replaces per-author list with a single distribution graph titled Commits by author (distribution graph).
    • Graph bars switch from # to . and respect --top filtering.
    • Keeps total commits and unique author count in summary line; resolves end label for latest commit.
• Versioning
  • Bump loki-cli from 0.10.0 to 0.10.1 in Cargo.toml and Cargo.lock.

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