feat(filter): add reverse layout

[dhruvmanila]

resolves: #114

Changes

Add --reverse flag to gum filter command to display the list in reverse direction similar to the default layout for fzf

[maaslalani]

Hey, this looks almost good to go. One last case we need to handle is when you are in --reverse and scroll up past the viewport and then filter (by typing more text) the cursor will be off the screen. We would need to clamp it to be inside the viewport.

To reproduce:

gum filter --reverse --height 10

Press Up 20 times

Type: Dock

The cursor will be off the screen

[maaslalani]

Awesome work @dhruvmanila, thank you so much for the contribution!