[TS-983]<feature>(connector,query,insert,other):create subtable to specific vgroups by _taos_meta_sync_table_name_taos_

* [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>: alter Keep Alive Time in RESTful pool
Co-authored-by: Nxywang <xywang@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>

specify child table name instead using ID in tag field.

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

to defaultJSONType, as this param will also be used to set JSON tags
default string types.

to binary/nchar through smlDefaultJSONStrType param