Feature Request: Add :Copilot Ask FastCommand for Quick Inline Queries

I’ve noticed that the Copilot Chat feature is still being explored ([here](https://github.com/github/copilot.vim/issues/57))

In the meantime, I would like to propose a lightweight feature that could provide immediate value: a "FastCommand"` interface for quick, inline queries.

Proposed Feature:

Introduce a command such as: `:Copilot Ask center the div`

This command would send the prompt directly to Copilot and apply the result to the current file buffer (or return an inline suggestion), without requiring a full chat interface.