Add support for non-default ANSI MODE of MySQL sources.

* Which ClickHouse server version to use
21.3.12.2 (official build).

MySQLDictionarySource: Cannot find table in SHOW TABLE STATUS result.

```log
2021.08.18 10:47:35.986046 [ 41658 ] {} ExternalDictionariesLoader: Start loading object '45e4489a-6353-4e9c-864e-de030e1ed1bb'
2021.08.18 10:47:35.986171 [ 41658 ] {} mysqlxx::Pool: Connecting to db@10.2.1.1:3306 as user ruser
2021.08.18 10:47:36.045025 [ 41658 ] {} mysqlxx::Pool: Entry(connection 18677358): sending PING to check if it is alive.
2021.08.18 10:47:36.059678 [ 41658 ] {} mysqlxx::Pool: Entry(connection 18677358): PING ok.
2021.08.18 10:47:36.059697 [ 41658 ] {} mysqlxx::Pool: Entry(connection 18677358): sending PING to check if it is alive.
2021.08.18 10:47:36.074322 [ 41658 ] {} mysqlxx::Pool: Entry(connection 18677358): PING ok.
2021.08.18 10:47:36.074337 [ 41658 ] {} MySQLDictionarySource: SHOW TABLE STATUS LIKE 'td\\_area'
2021.08.18 10:47:36.074361 [ 41658 ] {} mysqlxx::Query: Running MySQL query using connection 18677358
2021.08.18 10:47:36.090609 [ 41658 ] {} MySQLDictionarySource: Cannot find table in SHOW TABLE STATUS result.
2021.08.18 10:47:36.090630 [ 41658 ] {} MySQLDictionarySource: SELECT `area_code`, `area_name` FROM `db`.`td_area`;
2021.08.18 10:47:36.090662 [ 41658 ] {} mysqlxx::Pool: Connecting to db@10.2.1.1:3306 as user ruser
2021.08.18 10:47:36.149062 [ 41658 ] {} mysqlxx::Pool: Entry(connection 18725404): sending PING to check if it is alive.
2021.08.18 10:47:36.163600 [ 41658 ] {} mysqlxx::Pool: Entry(connection 18725404): PING ok.
2021.08.18 10:47:36.163614 [ 41658 ] {} mysqlxx::Query: Running MySQL query using connection 18725404
2021.08.18 10:47:36.181153 [ 41658 ] {} ExternalDictionariesLoader: Supposed update time for '45e4489a-6353-4e9c-864e-de030e1ed1bb' is 2021-08-18 10:52:54 (loaded, lifetime [300, 360], no errors)
2021.08.18 10:47:36.181175 [ 41658 ] {} ExternalDictionariesLoader: Next update time for '45e4489a-6353-4e9c-864e-de030e1ed1bb' was set to 2021-08-18 10:52:54
```
* run the sql : SHOW TABLE STATUS LIKE 'td\\\\_area'
* run sql : SHOW TABLE STATUS LIKE 'td_area'