add Get method to model registry

registry.go

@@ -234,6 +234,14 @@ func (r TModelRegistry) new_(n string) interface{} {
 	return nil
 }
 
+func (r TModelRegistry) Get(name string) *Model {
+	model, ok := r[name]
+	if !ok {
+		return nil
+	}
+	return model
+}
+
 // Model registers models in the ModelRegistry, where
 // they can be accessed via a model's struct name
 func (r TModelRegistry) Model(mdl ...any) {