[WIP] Cache for protection lookups

[WalshyDev]

This implements a Guava Cache to the ProtectionManager. We have this so that we can cache what the permission is on a block for a player.

The overhead of this isn't too much as it will remove the entry if it isn't read for 5 mins (approx).

Current Issues

There are a few things to work through first though:

• This is ugly, is there a better way to represent and save this data?
  • I am not a fan of using 2 caches here but what is the better way? A Map instead of the inner cache would mean the data is saved way more
• If a permission was changed after we cached it, what do we do?
  • We can change this to expireAfterWrite which would lessen the performance improvement but at least work.
  • If we changed to expireAfterWrite then there is (approx) 5 mins where a player could complain over the old cache

Definitely some feedback needed on this - @TheBusyBiscuit @md5sha256