feat(cli/bench): add shell completion

[doringeman]

Add ValidArgsFunction to suggest available model names when tab-completing the MODEL argument.

[gemini-code-assist]

Summary of Changes

Hello @doringeman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the user experience of the command-line interface by adding shell completion functionality to the bench command. Users can now easily discover and select available model names through tab completion, streamlining their workflow and minimizing potential input errors when running benchmarks.

Highlights

• Shell Completion: Introduced shell completion for the MODEL argument within the bench command, allowing users to tab-complete available model names.
• New Completion Package: Integrated a new completion package to provide dynamic suggestions for model names, enhancing CLI usability.
• Argument Validation Update: Updated the argument validation for the bench command to use a custom requireExactArgs function.

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[gemini-code-assist]

Code Review

This pull request introduces shell completion for the MODEL argument of the bench command, which is a nice enhancement for the CLI's usability. The implementation correctly uses ValidArgsFunction. However, I've identified a high-severity issue in the underlying completion helper function where an unhandled error could lead to a panic during tab completion. Please see the detailed comment for the fix.