test(tmq): enable drop table case

docs: copy 2.6 documentation to 3.0 as the base

fix(query): ignore the check of qualified table id.

feat: dump sdb.data to json format

fix: retry if no enough shm

fix: unit test in json scalar operator

feat: refresh table meta based on sversion

feat(query): add nested query function

test:add testcase of   multi-Thread inserting data

3.0

fix: deal with error in schemaless

refactor(stream)

feat: add scenarios that trigger metadata refresh