enh(query): add _group_key function for partion by

TD-16805

test: refine some cases

feat: subplan adds 'user' field

fix: fix bugs of less output when interval overlaps

add test case for irate and check value of all

test: add case for scalar function for null value

refactor(sync): adjust log buf size

ci: optimize Jenkins log

test(stream): partition by tbname

test：update test case 

enh: refactor show variables

fix: handle rpc retry except

test: add test time count print