Show container size when running list command

## Is your feature request related to a problem? Please describe.
I want to be able to know the size of my installed containers. If you have many different toolboxes with different configurations like different packages, different distributions and different installed packages it would be good to be able to compare sizes between them.

## Describe the solution you'd like
A column with size when running `toolbox list`.

## Describe alternatives you've considered
A flag to pass to the `toolbox list` command to show sizes.

## Additional information

Related to https://github.com/containers/toolbox/issues/752.

Start by locating the implementation of the `toolbox list` command and review related issue #752. Determine how installed container sizes should be obtained and displayed in the list output; done means the command shows a size column or an explicitly requested size view.

Written by the indexing model from the issue text.