Dameng DATETIME WITH TIME ZONE not supported

Running

```CREATE TABLE "roles"
(
    "id"  BIGINT IDENTITY(1, 1) PRIMARY KEY,
    "role_id" VARCHAR(40) DEFAULT '',
    "role_name" VARCHAR(50) DEFAULT '',
    "created_at" DATETIME WITH TIME ZONE
);
```

the error info is 

```

ParserError("Expected: ',' or ')' after column definition, found: WITH at Line: 19, Column: 31")
```