feat: references check

... and fixes: parse fields without tags and other logical errors

tests/testdata/src/references_check/positive.go

@@ -0,0 +1,19 @@
+package references_check
+
+type User struct {
+	Name      string
+	CompanyID string
+	Company   Company `gorm:"references:code"` // want "Related field \"code\" doesn't exist on model \"Company\""
+}
+
+type Company struct {
+	ID   int
+	Code string
+	Name string
+}
+
+type Order struct {
+	Id        uint   `gorm:"primaryKey"`
+	CompanyID string `gorm:"references:Code"` // want "Related model \"string\" doesn't exist"
+	Company   Company
+}