[TD-2978]stop query when first round with empty result

[TD-2992]<feature>:support between/and in sql

[TD-3019]stddev and group by with same column issue

[TD-2972]remove fetch retry

[TD-2995]change insert result comment

[TD-3004]fix mem leak issue

coverage test/CI: add start time for each case

[TD-2133]<feature>: add queryService in java taosdemo

[TD-2999]<fix>: [http] fix NULL parser crash

[TD-2996]<fix>: reset pContext->singleCmd to zeroes when httpReleaseContext(pContext, true)

Feature/sangshuduo/td 2971 python connector support unsigned