* [TD-5136]<feature>: taosdemo simulate real senario.

* update test case according to taosdemo change

* adjust range of semi-random data.

* make demo mode use different tag name and value.

* [TD-5242]<feature>: taosdemo support max columns align with TSDB defines.

* fix records/sec format.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>