refactor: adjust logs

test:modify testcase of mnode

refactor(sync): update to SYNC_STRATEGY_WAL_FIRST

enh: add test to index

feat(stream): stream support expressions

fix: some problem of parser and planner

refactor: do some internal refactor and fix some memory leak.

fix(sync): vnode snapshot sender

fix(query): set correct stddev merge input rows.

feat(tmq): support consume from tsdb then wal

Enh: add ut test to idx

fix: fix aggregate function and null issue

refactor(stream)

feat:write meta from tmq to taosd