Different gamerules per dimension

I propose to allow the override of global gamerules for each dimension.

If no [dimension] parameter is specified, it will be applied globally (as it is now).
If a [dimension] parameter is specified, it will be applied only to the target dimension.

E.g.
/execute in some:dimension run gamerule mobGriefing false
would override mobGriefing gamerule for some:dimension