* [TD-6294]<fix>: taosdemo support long arg

fix conflict with develop branch.

* fix few words.

* declare default child tables number.

* add support email prompt.

* support the way no space between param and value

* fix -PP arg.

* fix uncatched status.

* fix total child tables bug.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>