Add Registry#getTags (#11795)

paper-server/src/main/java/io/papermc/paper/registry/PaperSimpleRegistry.java

@@ -3,6 +3,7 @@ package io.papermc.paper.registry;
 import io.papermc.paper.registry.set.NamedRegistryKeySetImpl;
 import io.papermc.paper.registry.tag.Tag;
 import io.papermc.paper.registry.tag.TagKey;
+import java.util.Collection;
 import java.util.function.Predicate;
 import net.minecraft.core.HolderSet;
 import net.minecraft.core.registries.BuiltInRegistries;
@@ -51,4 +52,9 @@ public class PaperSimpleRegistry<T extends Enum<T> & Keyed, M> extends Registry.
         final HolderSet.Named<M> namedHolderSet = this.nmsRegistry.get(PaperRegistries.toNms(key)).orElseThrow();
         return new NamedRegistryKeySetImpl<>(key, namedHolderSet);
     }
+
+    @Override
+    public Collection<Tag<T>> getTags() {
+        return this.nmsRegistry.getTags().<Tag<T>>map(NamedRegistryKeySetImpl::new).toList();
+    }
 }