Allow checklist task in markdown to be dragged to another list

Problem to solve

It's great to be able to drag and drop task list items in the issue description without editing the page, but it's not currently possible to drag the item into another list. This was revealed in a customer invterview.

move-tasks-between-lists

Proposal

Allow the checklist item to be dropped onto another list and have the markdown updated accordingly.

Intended users

Feature Usage Metrics