1. rename semphone to semaphore
2. add comment for tsched.h
3. change the function signature for taosSchedulerTask, changing from
return int to void. We currently don't check any return code of the function.
4. add some error handlings. For fatal error, just exit the process because
the program may run into a random state.

[TD-4926]<fix>:fix core during operator time usage calculate

* fix crash if no result file.

* make taosdemo same as master branch.

[TD-4756]<fix>: nanosecond precison on gcBuildQueryJson

[TD-4561]feature:support statistics about operators running time

Feature/query

[TD-4879]fix mem leak issue

[TD-4098]<fix> unsigned date type not found

Docs/update latest feature

add test case to verify taosdump with binary and nchar data

add test case to verify taosdump with binary and nchar data

[TD4824]<in function,add data type like timestamp,float and double>

* [TD-4902] FIX with 1 char

* Fix prompt of -m @ taosdemo

[TD-1568]fix tdMergeDataCols compare key bug

* [TD-4823]<fix>: taosdemo getTableName return empty.

* fix typo.

* check table name is empty in early stage.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4892]<fix>: taosdemo subscribe fetch result. for develop branch

* fix stbname length.

* restrict prefix length.

* submit empty

* fix minor code.

comment  "nestedQuery/queryInterval.py"

* [TD-4872]<fix>: fix buffer overflow in -O3 build

* [TD-4872]<fix>: fix tasodemo buffer overflow with -O3

* [TD-4872]<fix>: fix tasodump buffer overflow with -O3

pytest utils add taosdemoCfg.py