[FEAT]: Generic GitHub copilot usage

[ericcurtin]

Describe the need

I would like to be able to send generic requests via this tool as if we were on a new https://github.com/copilot webpage, an example:

gh copliot "Fix this code: the code........"

An alternate tool for this would be fine also.

[smotraghi-shopify]

+1. I would be very interested in the ability to ask copilot about my codebase.