Release/ver 2.1.5.0

[TD-5429]<hotfix>:executing group by test suite throws uninitialized semaphore error

[TD-5431]<fix>:fix hashDistinct bug about var_data_type value keys

[TD-5449]<fix>:adapt max sql string length for maxium columns

[TD-5459]<fix>: fix sql parse core error

[TD-5454]<fix>: fix arm32 qDebug error

[TD-4647] support auto adding columns through line protocol

[TD-5434]fix table name issue

Compress float

* [TD-5342]<feature>: change fastjson and guava version, add retryHandle in HttpClientPoolUtil

* fix some simple problems

* [TD-5300]<fix>: taosdemo stmt debug print.

* fix default iface is unknown.

* set thread name enabled on develop branch.

[TD-5038] test case for flushing while drop database

Hotfix/td 5388

[TD-4816]create stable and insert script for robust test

[TD-5431]<fix>:fix hashDistinct bug that var_data_type value use the the maxmium length as the key length

* [TD-5300]<fix>: taosdemo stmt debug print.

* fix default iface is unknown.

[TD-5331]optimize bind insert performance

[TD-5234]<feature>: added name for threads