Sql. Negative column indexes in ORDER BY clause are not rejected

The simple example:

SELECT * FROM test ORDER BY -1

See test_order_by_exceptions.test.

Add statement error: <err message> to other test cases as well.

It seems that this issue is caused the current implementation of IgniteSqlValidator::validateLiteral which skips the validation entirely

@Override
public void validateLiteral(SqlLiteral literal) {
    if (literal.getTypeName() != SqlTypeName.DECIMAL) {
        super.validateLiteral(literal);
    }
}