fix: invalid free in unittest

feat(tmq): add push mode

feat: fix qnode list type issue

Feature/sync vnode merge 3.0

fix(driver): the user specified port that is in taos_connect API isn't active.

fix: some syntax parsing problems

fix: bugs in to_json

feat(udf):fix start/stop/restart udfd

refactor(query): limit cast var type length to 1000

fix(query): fix convertStringToTimestamp considering daylight saving