Filter commits

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

Hi team,

I would find it very useful to not only search for commits, but also filter them (as described in https://github.com/jesseduffield/lazygit/blob/master/docs/Searching.md).

Do you think it would be feasible?

### Describe the solution you'd like

Pressing `` (or other) in the commit panel would show an input (like "Search" when pressing `/`), and anything that's typed in it would filter the commits accordingly.

### Additional context

Thanks for this great TUI