[markdown] when hitting enter/return in a list, automatically add new list item
## Issue
When typing a markdown list it can be a little annoying to continually type the bullet/checkbox/number each time I add a new line. I'm so used to using other software that maintains the formatting on new lines.
## Proposal
Maintain formatting of Markdown when new lines are entered.
This behaviour is for editing raw Markdown. The Content Editor currently has this behaviour of maintaining list formatting for a new line.
For example:
* If I add a bullet point and hit `enter`
* The next line should automatically start with a bullet point
We should do this for bullet lists, numbered lists, and tasks lists.
This is the same behavior in word processing software (Word, Google docs, slides, etc)
issue