feat: add list support

[ItzDerock]

Discord list parser, from my testing, works like this:

• List items can start with *, {number}. or - followed by any number of spaces.
• You can continue a list as long as there is less than 2 line breaks:

  * This is part of the list
    And so is this
    
    But this isn't

• For the above, there must be some bit of space at start for it to be considered part of the same list item

  * List start
    Part of that same list block
  Not part of list, new paragraph