Allow to convert Whiteboard note to a Requirement Merged

Who would benefit?

Whiteboard users

What impact would it make?

Ability to fully drill-down workitem breakdown/refinement when using whitboard for User story mapping (example)

How should it work?

Currently notes can be converted to several Aha workitem types, among those Epics and Features. Added to the list of converted/resulting workitems is Requirement.