Fix/3.0_merge_main

* fix:get system info on windows

* fix:head file

* fix:del tchar.h

test: check result after reboot without commit for tsma/rsma

* fix: install.sh to remove exist rpm

* fix: install.sh to remove exist rpm

* fix: refine packaging/tools/install.sh

* fix: silient if no exist rpm

* fix: dpkg remove exist deb

* fix: refine sentence

docs: add description of keep/multi-tier storage

* build: add python demo to ci

* build: add fast write example to ci

* build: add kafka demo to ci

* fix kafka demo

* fix python demo

* fix python demo

* fix python demo

* fix python demo

* fix python demo

enh: flush database in testcase alter_replica_13.sim to trigger snapshot repl

enh: trim the last WAL idx file which is not fsynced

fix: tqOffsetSnapRead success on tq/offset-ver not existing

fix: round lastApplyIndex up to beginIndex -1 in syncBeginSnapshot

ci:add taosx compilation in ci

fix(query): add qsort for alpine.

doc: fix the syntax of the show vnodes command

Fix/TD-21761