not perform SDataRow/SKVRow convert anymore, utilize boundNullLen to facilitate the memRowType predict

calculate the memRowType precisely when NonVarType exists as to minimize the memory copy and to avoid of sorting for ordered input

* [TD-11063]<fix>: Support gcc4.4.

* [TS-615]<CI>add Ningsi OS

* make jenkins happy
Co-authored-by: Nliuyq-617 <yqliu@taosdata.com>

* [TS-498]<test>: add a test case for HttpClientPoolUtil

* [TS-498]<fix>: fixed 'no sql input' bug

* throw exception when httpEntity is null

* [TS-498]<fix>: change taosd keepAlive to 30s
Co-authored-by: Nxywang <xywang@taosdata.com>

add tsClientMerge option to enable or disable client merge row and fix server duplicate row merge bug in skiplist