[GO] Add assert constraints checks for complex types in the model template (#18654)

* [GO] Add assert constraints checks for complex types in the model template

* [GO] Update samples

* [GO] revert AssertRecurseInterface naming

samples/openapi3/server/petstore/go/go-petstore/go/model_an_object.go

@@ -37,5 +37,13 @@ func AssertAnObjectRequired(obj AnObject) error {
 
 // AssertAnObjectConstraints checks if the values respects the defined constraints
 func AssertAnObjectConstraints(obj AnObject) error {
+	if err := AssertTagConstraints(obj.Tag); err != nil {
+		return err
+	}
+	for _, el := range obj.Pet {
+		if err := AssertPetConstraints(el); err != nil {
+			return err
+		}
+	}
 	return nil
 }

samples/openapi3/server/petstore/go/go-petstore/go/model_pet.go

@@ -60,5 +60,17 @@ func AssertPetRequired(obj Pet) error {
 
 // AssertPetConstraints checks if the values respects the defined constraints
 func AssertPetConstraints(obj Pet) error {
+    if obj.Category != nil {
+     	if err := AssertCategoryConstraints(*obj.Category); err != nil {
+     		return err
+     	}
+    }
+    if obj.Tags != nil {
+     	for _, el := range *obj.Tags {
+     		if err := AssertTagConstraints(el); err != nil {
+     			return err
+     		}
+     	}
+    }
 	return nil
 }

samples/openapi3/server/petstore/go/go-petstore/go/model_user.go

@@ -64,5 +64,13 @@ func AssertUserRequired(obj User) error {
 
 // AssertUserConstraints checks if the values respects the defined constraints
 func AssertUserConstraints(obj User) error {
+    if obj.DeepSliceModel != nil {
+     	if err := AssertRecurseInterfaceRequired(*obj.DeepSliceModel, AssertTagConstraints); err != nil {
+     		return err
+     	}
+    }
+	if err := AssertRecurseInterfaceRequired(obj.DeepSliceMap, AssertAnObjectConstraints); err != nil {
+		return err
+	}
 	return nil
 }