Replace ConfiguredStructure api with Structure (#8642)

patches/api/Expand-world-key-API.patch

@@ -82,9 +82,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/org/bukkit/UnsafeValues.java
 +++ b/src/main/java/org/bukkit/UnsafeValues.java
 @@ -0,0 +0,0 @@ public interface UnsafeValues {
-      * @throws IllegalArgumentException if there isn't a registry for that type
+      * Use this when sending custom packets, so that there are no collisions on the client or server.
       */
-     <T extends Keyed> @org.jetbrains.annotations.NotNull Registry<T> registryFor(Class<T> classOfT);
+     public int nextEntityId();
 +
 +    /**
 +     * Just don't use it.