[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

[TD-3825] <fix> to fix bug which make with asan caused。modified by hjLiao.