bukkit: Implement BlockDataArgument

[jpenilla]

Implements a parser for BlockData. This wraps Minecraft's BlockState ArgumentType.

The Brigadier parser we are wrapping can technically parse NBT data in addition to type and properties, but there isn't exactly a good way to expose a raw CompoundTag to the Bukkit API world.

In vanilla, the parsed NBT is only ever used when setting blocks in the world. The return type for the vanilla argument is BlockInput, and it has a method which sets a block in the world to the parsed BlockState, and then if it is a BlockEntity applies the parsed NBT.

We could probably return a wrapper around BlockInput, similar to ProtoItemStack, and expose the aforementioned method, however I'm not sure if this is something that would even be desired, or if the wrapper would just be annoying to unbox every time.