Add an icon for raid leader/assist.

[CXWRTH]

Is your feature request related to a problem? Please describe:

I'd like one of the indicators to be who the raid leader and the raid assists are.

Describe the solution you'd like to see implemented:

Similar to what many of the unit frame replacements have out there. I want to keep using blizzard frames though.

Describe alternatives you've considered:

Looking for addons or weakauras that improve the default UI frames.

Additional context:

In attached image the leader has a crown icon top left.
The assists will have outlined crowns.