Add configurable spawn chance of dungeons to config

[DeshiDesu]

Version used: DungeonCrawl-1.18.2-2.3.10.jar
MC 1.18.2
Forge With Optifine

On Aternos, my server is suffering from the strain of logic on spawners, resulting in frequent spikes in server TPS. This is tested using a mod called Observable. These dungeons also spawn frequently and theres no option in the config to decrease their chances of spawning. Please add a config option to tweak the spawn chances of the dungeon or even better an option to reduce the amount of spawner rooms of the dungeon. I could have bought a more powerful server but I do not have the money.