[Java Edition] - Convert some enums to classes to aid modding

It would be fantastic for the modding community if some enums would be changed into classes so they can be instantiated and/or extended.

Some examples would be

• ArmorMaterials
• Tiers
• EnchantmentCategory
• Rarity
• DyeColor
• ChatFormatting
• MobEffectCategory
• MobCategory
• EquipmentSlot
• EquipmentSlot.Type
• SoundSource
• NoteBlockInstrument
• BannerPattern
• Difficulty
• GameType
• MobSpawnType
• MoverType
• GossipType
• LightLayer
• FrameType
• UseAnim
• Pose