Support custom biomes in RequirementTypes

[FireML]

This change only works on 1.21.3 and above due to Spigot API changes introduced in 1.21.3.

• Adds support for custom biomes in BiomeRequirementType
• Adds support for custom biomes in BiomeSetRequirementType
• Adds FishUtils#getBiome(String) so we don't repeat any code

Example:

      requirements:
         biome:
          - jungle
          - minecraft:jungle # This works the same as jungle, you can use either format for vanilla biomes.
          - terralith:yellowstone