implement single biome provider addon

common/addons/biome-provider-single/src/main/java/com/dfsek/terra/addons/biome/single/SingleBiomeProviderAddon.java

@@ -0,0 +1,38 @@
+package com.dfsek.terra.addons.biome.single;
+
+import com.dfsek.tectonic.loading.object.ObjectTemplate;
+import com.dfsek.terra.api.TerraPlugin;
+import com.dfsek.terra.api.addon.TerraAddon;
+import com.dfsek.terra.api.addon.annotations.Addon;
+import com.dfsek.terra.api.addon.annotations.Author;
+import com.dfsek.terra.api.addon.annotations.Version;
+import com.dfsek.terra.api.event.events.config.pack.ConfigPackPreLoadEvent;
+import com.dfsek.terra.api.event.functional.FunctionalEventHandler;
+import com.dfsek.terra.api.injection.annotations.Inject;
+import com.dfsek.terra.api.registry.CheckedRegistry;
+import com.dfsek.terra.api.util.reflection.TypeKey;
+import com.dfsek.terra.api.world.biome.generation.BiomeProvider;
+
+import java.util.function.Supplier;
+
+@Addon("biome-provider-single")
+@Author("Terra")
+@Version("1.0.0")
+public class SingleBiomeProviderAddon extends TerraAddon {
+    public static final TypeKey<Supplier<ObjectTemplate<BiomeProvider>>> PROVIDER_REGISTRY_KEY = new TypeKey<>() {};
+
+    @Inject
+    private TerraPlugin main;
+
+    @Override
+    public void initialize() {
+        main.getEventManager()
+                .getHandler(FunctionalEventHandler.class)
+                .register(this, ConfigPackPreLoadEvent.class)
+                .then(event -> {
+                    CheckedRegistry<Supplier<ObjectTemplate<BiomeProvider>>> providerRegistry = event.getPack().getOrCreateRegistry(PROVIDER_REGISTRY_KEY);
+                    providerRegistry.register("SINGLE", SingleBiomeProviderTemplate::new);
+                })
+                .failThrough();
+    }
+}