fix(query): return error code instead of assert.

fix: deadlock of vnode if its state changed

fix: make unit tests building works

refactor(sync): update DEFAULT_DB_WAL_RETENTION_PERIOD

doc: remove win32 from doc

docs: add stable query description

fix: fix dumplicated ctg callback issue

* docs: update connector for 3.0

* docs: remove continous query from connector doc

* docs: update readme connector part

* docs: fill tabs of tmq.md

* docs: fix 07-tmq.md

docs: update data query doc

docs: update 06-stream.md for stream-computing

* docs: update connector for 3.0

* docs: remove continous query from connector doc

* docs: update readme connector part

* docs: fill tabs of tmq.md

fix: query ins_tags failure when no vgroups;

fix: deadlock of mnode if its state changed

fix: fix sysdb user authentication failure

docs: add tmq example in python