Sorting feature in list of images and volumes

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

First of all kudos for lazydocker, it's awesome. My feature request would be to be able to sort the images list and volumes according by size and date (and current alphabetical) so that it can be used to clean up big images for example. I'm looking for a way similar to `ncdu` (https://dev.yorhel.nl/ncdu) where we can easily find big volumes or big images and delete them without having to copy/paste identifiers.

**Describe the solution you'd like**
Add and extra shortcut (s - sort by) or (t - sort by time/date, s - sort by size, a - sort by alphabetical)

**Describe alternatives you've considered**
Running through the list and checking the size in the other panel