Add some custom command argument types

[Emirlol]

Added an EggTypeArgumentType for the egg finder's location sharing command (not that anyone would use it manually, but I just wanted to) and ClientBlockPosArgumentType because the one minecraft has (BlockPosArgumentType) requires a ServerCommandSource, and since these are client-side commands we don't have an instance of ServerCommandSource. That led to this monstrosity:

context.getArgument("pos", PosArgument.class).toAbsoluteBlockPos(new ServerCommandSource(null, context.getSource().getPosition(), context.getSource().getRotation(), null, 0, null, null, null, null)

So now you can do this:

context.getArgument("pos", ClientPosArgument.class).toAbsoluteBlockPos(context.getSource())

or this for short:

ClientBlockPosArgumentType.getBlockPos(context, "pos")

I've updated the usages of BlockPosArgumentType to use the custom one instead. I've also noticed that the /skyblocker diana clearGriffinBurrow pos command wasn't working due to incorrect class given as the argument to the context.getArgument method, and fixed that along the way. Additionally, there are some minor code cleanups here and there.

[Emirlol]

As a side note, I've tested this on the egg finder command and the clearGriffinBurrow command. Perhaps not exhaustively, but it's better than nothing.

Also these argument types aren't registered to the map in ArgumentTypes class because I thought it was unnecessary, and it would add more stuff to maintain over new version changes as they need serializers and all that. It seems like that's only used for S2C command packets and dumping commands in a json, which isn't all that important. Though, if anyone knows a reason why they should be registered, let me know.