[td-6640]fix stddev memory leak issue

merge from 2.0 into master

[TD-5229]<fix>: Fix a small-probability bug

ver 2.2.0.2-change version number

[TD-6521]<feature> update table meta after altering table schema

[TD-6663]<feature> support rpcForceTcp

<TD-6636><hotfix>: row convert fix and schema version fetch optimize

* cherry pick from develop branch.

* [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.

* change malloc to calloc for pid allocation.

* fix typo.

* fix binary length default value and group id logic.

* fix help msg.

* fix aggregation func test.

* minor typo fix.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

[TS-357]<fix>: NULL column in a row was specially processed

[td-6639]fix windows symbol issue

Test/td 6633 2.0

add master branch test case

* cherry pick from develop branch.

* fix conflict and reformat by autopep8.

ver-2.2.0.1: change version number

[TD-6635]<test>:modify python file about ts = 1600000**

Co-authored-by: NMinglei Jin <mljin@taosdata.com>