Hotfix/sangshuduo/td 4296 taosdemo subscribe keepprogress (#6221)

* [TD-4296]<fix>: taosdemo sub keepProgress.

* make print sqlcount quiet.

* [TD-4296]<fix>: taosdemo subscribe keepprogress.

specified query topic thread safe.

* [TD-4296]<fix>: taosdemo subscribe keepProgress.

specified query thread safe.

* fix compile warning for mac.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>