feat(cli): add sql_delimiter set

[sundy-li]

changes:

1. support setting sql_delimiter in cli which fixes bug: bendsql parse task with begin end will return err #648

example:

🐳 root@default:) !set sql_delimiter %
🐳 root@default:) explain ast CREATE TASK IF NOT EXISTS MyTask1 SCHEDULE = 1 SECOND as
begin
    begin;
    insert into t values('1');
    delete from t ;
    vacuum table t;
    SELECT
          {

              'avg_ads_rev': case when number=0 then 0
                                  when number=0 then 0.083903
                                  else (1/number)::DECIMAL(14,6) end
          }  AS features
    FROM t
    commit;
end%
-[ EXPLAIN ]-----------------------------------
CREATE TASK IF NOT EXISTS MyTask1 SCHEDULE = 1 SECOND AS BEGIN
BEGIN;
INSERT INTO t VALUES ('1');
DELETE FROM t;
VACUUM TABLE t ;
SELECT {'avg_ads_rev':CASE WHEN number = 0 THEN 0 WHEN number = 0 THEN 0.083903 ELSE (1 / number)::Decimal(14, 6) END} AS features FROM t AS commit;
END;

7 rows explain in 0.002 sec. Processed 0 rows, 0 B (0 row/s, 0 B/s)

2. quote_string is set to false by default