Add `uv tool list --outdated` to show outdated tools

[j178]

Summary

Add uv tool list --outdated, similar to uv tree --outdated and uv pip list --outdated, to display only outdated tools.

cargo run -- tool list --outdated
ipython v8.29.0 (latest: v8.30.0)
- ipython
- ipython3
maturin v1.7.4 (latest: v1.7.7)
- maturin
ruff v0.8.0 (latest: v0.8.1)
- ruff
yt-dlp v2024.11.18 (latest: v2024.12.3)
- yt-dlp

Closes #9309

[zanieb]

@charliermarsh I think you have more context on the --outdated implementations — but let me know if you'd prefer that I review.

[charliermarsh]

👍 No worries, I can take this.

[j178]

Hi @charliermarsh, could you take a look at this PR? Let me know if there’s anything I can do to help move it forward!