Switch Impl types to Holderable (#11662)

* Switch Impl types to Holderable

* Fix compile issues

* more improvements

* compile fixes

* remove unneeded unwrapAndConvertHolder call

---------

Co-authored-by: Bjarne Koll <git@lynxplay.dev>

patches/server/Improve-Registry.patch

@@ -38,7 +38,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      private final Map<NamespacedKey, B> cache = new HashMap<>();
 +    private final Map<B, NamespacedKey> byValue = new java.util.IdentityHashMap<>(); // Paper - improve Registry
      private final net.minecraft.core.Registry<M> minecraftRegistry;
-     private final BiFunction<NamespacedKey, M, B> minecraftToBukkit;
+     private final io.papermc.paper.registry.entry.RegistryTypeMapper<M, B> minecraftToBukkit; // Paper - switch to Holder
      private final BiFunction<NamespacedKey, ApiVersion, NamespacedKey> serializationUpdater; // Paper - rename to make it *clear* what it is *only* for
 @@ -0,0 +0,0 @@ public class CraftRegistry<B extends Keyed, M> implements Registry<B> {
          }
@@ -49,9 +49,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          return bukkit;
      }
 @@ -0,0 +0,0 @@ public class CraftRegistry<B extends Keyed, M> implements Registry<B> {
- 
-         return this.minecraftToBukkit.apply(namespacedKey, minecraft);
+         return this.minecraftToBukkit.convertDirectHolder(holder);
      }
+     // Paper end - support Direct Holders
 +
 +    // Paper start - improve Registry
 +    @Override