enh: refact sync callback func

fix: remove last stt load info resetting from fs iterator

fix: fsync wal files and meta if data size not synced yet beyond a threshold

doc: update show variables

fix: wrong cpu usage

fix: invalid read problem of tsdb path

refactor: add some logs.

enh: refact syncMsg code

refactor(stream): fill history

* fix: taosbenchmark query concurrent segfault

update taos-tools 719fc88

* fix: taosbenchmark free null child tbl name

test: adjust unstable case

fix(query): leastsquares handles unsigned types

enh(query): improve the aggregate performance.

fix: drop index error

enh: check completeness of WAL log entries after repairing

fix(query): set search key according to order

* fix: jemalloc compile error

* fix: jemalloc compile error

* fix: add jemalloc as dependency of taosd and udf
Co-authored-by: afwerar <1296468573@qq.com>

enh: support get meta only from cache