Allow tagging, pushing, and pulling images

**Is your feature request related to a problem? Please describe.**
It would be good if we could tag, push, and pull images from the images panel.

**Describe the solution you'd like**
* In the images panel when you press 't' it should bring up an input prompt for you to enter a tag and then upon pressing enter it should tag the selected image with that tag.
* When you press 'p' it should bring up a prompt to enter an and tag in the form "image:tag" to pull
* When you press 'P' it should push the current image, with a confirmation asking if you're sure you want to

**Describe alternatives you've considered**
The pull feature would benefit from actually trying to search dockerhub, but we can leave that for another PR.

**Additional context**
the 'p', 'P' thing will be familiar for people who use lazygit