feature: Support OMP (oh my pi)

### Did you check the docs?

- [x] I have read all the sidekick.nvim docs

### Is your feature request related to a problem? Please describe.

No problems. Love the plugin!

### Describe the solution you'd like

I'd love to have support for the OMP CLI

### Describe alternatives you've considered

Customizing Pi like OMP

### Additional context

_No response_