feat: add transformer for model

pkg/ast/model/transformer.go

@@ -0,0 +1,9 @@
+package model
+
+type Transformer struct {
+	Ignores struct {
+		Jet   []string `mapstructure:"jet"`
+		Model []string `mapstructure:"model"`
+	} `mapstructure:"ignores"`
+	Types map[string]map[string]string `mapstructure:"types"`
+}