Feature: scroll by line when hunk is too big for screen

[Piturnah]

Type of Feature

Style and UI

Description

There is often the case that the diff hunk is too big to be displayed in the terminal. In this case I think gex should behave like a pager such as less and allow for scrolling line by line. When the next hunk appears at the bottom of the screen it should go back to the normal behaviour.

Additional Information

Here is an example where the hunk is too big to see