Implemented postgres table and enum comment generation

generator/metadata/table_meta_data.go

@@ -1,8 +1,11 @@
 package metadata
 
+import "regexp"
+
 // Table metadata struct
 type Table struct {
 	Name    string `sql:"primary_key"`
+	Comment string
 	Columns []Column
 }
 
@@ -20,3 +23,13 @@ func (t Table) MutableColumns() []Column {
 
 	return ret
 }
+
+// GoLangComment returns table comment without ascii control characters
+func (t Table) GoLangComment() string {
+	if t.Comment == "" {
+		return ""
+	}
+
+	// remove ascii control characters from string
+	return regexp.MustCompile(`[[:cntrl:]]+`).ReplaceAllString(t.Comment, "")
+}