add --show-extras to uv tool list to list extra requirements installed with tools (#13783)

## Summary

Implemented as suggested in #13761 

eg.

```
$ uv tool install 'harlequin[postgres]'
$ uv tool list --show-extras
harlequin v2.1.2 [extras: postgres]
- harlequin
```

## Test Plan

Added a new test with the argument along with the others from the `uv
tool list` cli.

docs/reference/cli.md

@@ -2293,6 +2293,7 @@ uv tool list [OPTIONS]
 <p>This setting has no effect when used in the <code>uv pip</code> interface.</p>
 <p>May also be set with the <code>UV_PROJECT</code> environment variable.</p></dd><dt id="uv-tool-list--quiet"><a href="#uv-tool-list--quiet"><code>--quiet</code></a>, <code>-q</code></dt><dd><p>Use quiet output.</p>
 <p>Repeating this option, e.g., <code>-qq</code>, will enable a silent mode in which uv will write no output to stdout.</p>
+</dd><dt id="uv-tool-list--show-extras"><a href="#uv-tool-list--show-extras"><code>--show-extras</code></a></dt><dd><p>Whether to display the extra requirements installed with each tool</p>
 </dd><dt id="uv-tool-list--show-paths"><a href="#uv-tool-list--show-paths"><code>--show-paths</code></a></dt><dd><p>Whether to display the path to each tool environment and installed executable</p>
 </dd><dt id="uv-tool-list--show-version-specifiers"><a href="#uv-tool-list--show-version-specifiers"><code>--show-version-specifiers</code></a></dt><dd><p>Whether to display the version specifier(s) used to install each tool</p>
 </dd><dt id="uv-tool-list--show-with"><a href="#uv-tool-list--show-with"><code>--show-with</code></a></dt><dd><p>Whether to display the additional requirements installed with each tool</p>