Add SpellTypes generator (#4041)

Author: ImMorpheus

generator/src/main/java/org/spongepowered/vanilla/generator/GeneratorMain.java

@@ -57,6 +57,7 @@
 import net.minecraft.world.entity.animal.horse.Llama;
 import net.minecraft.world.entity.animal.horse.Markings;
 import net.minecraft.world.entity.animal.horse.Variant;
+import net.minecraft.world.entity.monster.SpellcasterIllager;
 import net.minecraft.world.entity.vehicle.Boat;
 import net.minecraft.world.item.DyeColor;
 import net.minecraft.world.item.ItemDisplayContext;
@@ -276,6 +277,13 @@ private static List<Generator> generators(final Context context) {
                  "getSerializedName",
                  "sponge"
             ),
+            new EnumEntriesValidator<>(
+                 "data.type",
+                 "SpellTypes",
+                 SpellcasterIllager.IllagerSpell.class,
+                 "name",
+                 "sponge"
+            ),
             new EnumEntriesValidator<>(
                  "data.type",
                  "FoxTypes",