feat: delete constraint for belongs to and has one

tests/testdata/src/relations_check/negative.go

@@ -65,8 +65,8 @@ type ShoppingCart struct {
 // Has one
 
 type Hotel struct {
-	Id uint `gorm:"primaryKey"`
-	Office
+	Id     uint `gorm:"primaryKey"`
+	Office      // want "field Office should have a delete constraint"
 }
 
 type Office struct {

tests/testdata/src/relations_check/positive.go

@@ -45,7 +45,7 @@ type Owner struct {
 	Id        uint `gorm:"primaryKey"`
 	Name      string
 	CompanyId int
-	Company   Company
+	Company   Company `gorm:"constraint:OnDelete:CASCADE;"`
 }
 
 type Company struct {