Cache to improve performance of "getFactionByChunk" method

[NoTimeForHero]

"getFactionByChunk" one of the most called methods by many listeners. But it iterating every time through every faction claims.

So I cached it with thread safe Guava cache. I limit the cache 30 seconds for safety, if someone will forget to invalidate cache after updating claims.

[Aquerr]

Looks good. Have you tested it in game by yourself?

[NoTimeForHero]

Yes, I tested it, but only locally (have no server with players for normal tests)