[Feature Request] Option to pad the whole list

[Frederick888]

For example, instead of

I. text
II. text
III. text
IV.  text
V.   text

...allow users to have

I.   text
II.  text
III. text
IV.  text
V.   text

I understand this doesn't make a difference in Markdown (doesn't hurt either tho), but it looks nice in code blocks and plain text files.

[avidseeker]

If the list items are numeric, it's better to pad with zero than to add unnecessary space. https://github.com/dkarter/bullets.vim/issues/142