fix: adding some entity methods for YAML

src/Nitride.Yaml/IsYamlExtensions.cs

@@ -0,0 +1,16 @@
+using Gallium;
+
+namespace Nitride.Yaml;
+
+public static class IsYamlExtensions
+{
+    public static Entity RemoveIsYaml(this Entity entity)
+    {
+        return entity.Remove<IsYaml>();
+    }
+
+    public static Entity SetIsYaml(this Entity entity)
+    {
+        return entity.Set(IsYaml.Instance);
+    }
+}