refactor(minestom): replace static singleton access to platform with dependency injection for better modularity

Renamed `MinestomPlatform` to `TerraMinestomPlatform` and updated `TerraMinestomWorldBuilder` to utilize the platform instance directly. Simplified world builder initialization and improved code clarity.

platforms/minestom/example/src/main/java/com/dfsek/terra/minestom/TerraMinestomExample.java

@@ -31,7 +31,8 @@ public class TerraMinestomExample {
     }
 
     public void attachTerra() {
-        world = TerraMinestomWorldBuilder.from(instance)
+        TerraMinestomPlatform platform = new TerraMinestomPlatform();
+        world = platform.worldBuilder(instance)
             .defaultPack()
             .attach();
     }