Command to list available models with multipliers

### Describe the feature or problem you'd like to solve

It would be great to have a command like `copilot models` that lists all available models with multipliers

### Proposed solution

It would be great to have a command like `copilot models` that lists all available models with multipliers

Even better if we get a json output, possibly with a flag `--json`.

### Example prompts or workflows

_No response_

### Additional context

_No response_