Added: OracleSqlParser - grammar support for XMLCAST and XMLEXISTS functions

Examples:
SELECT XMLCAST(XMLQUERY('/r/v' PASSING XMLTYPE('<r><c>id</c><v>value
1</v></r>') RETURNING CONTENT) AS VARCHAR2(100)) FROM DUAL;

SELECT * FROM DUAL WHERE XMLEXISTS('/r[c="id"]' PASSING
XMLTYPE('<r><c>id</c><v>value 1</v></r>'));