* [TD-182]<enhance>: use single repo for python connector

Remove code for each platform and build up one single python code base
for windows/osx/linux platforms and python2/python3 runtime.

* [TD-182]<enhance>: remove redundant code in python connector

* [TD-4149] <fix>: fix python connection config error

for develop branch.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

Feature/m2d

[TD-4038]support bind  multiple tables

[TD-3960] <test> add case for TD-3960

Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3902]<fix>: taosdemo subscribe.

* [TD-3992]<fix>: taosdemo subscribe.

refactor sync/async mode.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

Fix/query

* [TD-4073]<fix>: taosdemo rest query output to result file.

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix insecure strcat().

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix append function bug.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4073]<fix>: taosdemo rest query output to result file.

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix insecure strcat().

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix postSql command mistake

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix append function bug.

* [TD-4073]<fix>: taosdemo rest query output to result file.

prevent potential null file passed.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

[TD-4099]add assert info

[TD-4096]<feature> support 'show create stable xx'

Hotfix/td 4119

[TD-2639] <docs>: fix typo about "taos_open_stream".