Tokenizer/PHP: bug fix

Interface and trait names should always be `T_STRING`.

Author: jrfnl

src/Tokenizers/PHP.php

@@ -1899,6 +1899,8 @@ function return types. We want to keep the parenthesis map clean,
                         T_NULLSAFE_OBJECT_OPERATOR => true,
                         T_FUNCTION                 => true,
                         T_CLASS                    => true,
+                        T_INTERFACE                => true,
+                        T_TRAIT                    => true,
                         T_EXTENDS                  => true,
                         T_IMPLEMENTS               => true,
                         T_ATTRIBUTE                => true,