[Frostmourne] - speed kill/realm first announcements

Back then on lordaeron we had realm announcements for
- realm first kills of bosses on hard modes
- new speed kill records
I'm not talkin' about achievments here, but leaderboard that's on site

For example in ulduar Thorim hard mode, theres no achiev for that visible to everyone like REALM FIRST THORIM
but on Lordaeron there was announcement for such things

IMO it'd be really much more fun if there were announcements of new speed kills on realm and could make it more competitive
There used to be this thing 4 years ogo on Lordaeron, it doesn't seem too difficult to implement and it's cool feature that i'm sure more of us would like to see