feat: add Sudoku protocol inbound & outbound support (#2397)

constant/metadata.go

@@ -39,6 +39,7 @@ const (
 	HYSTERIA2
 	ANYTLS
 	MIERU
+	SUDOKU
 	INNER
 )
 
@@ -112,6 +113,8 @@ func (t Type) String() string {
 		return "AnyTLS"
 	case MIERU:
 		return "Mieru"
+	case SUDOKU:
+		return "Sudoku"
 	case INNER:
 		return "Inner"
 	default:
@@ -154,6 +157,8 @@ func ParseType(t string) (*Type, error) {
 		res = ANYTLS
 	case "MIERU":
 		res = MIERU
+	case "SUDOKU":
+		res = SUDOKU
 	case "INNER":
 		res = INNER
 	default: