test: del some fulltest case

enh(query): add top/bottom function distributed split

feature: explain mulitway merge and merge interval optimization

refactor: adjust logs

fix(query): add check for data completed.

fix:to make time sort stable if timestamp is same in schemalsee

feat: support mnode/vnode epset update

refactor: do some internal refactor of sample function.

feat: redistribute vgroup

test:add testcase of muti-mnode

* chore(release): make get_os.sh works on mac

* chore(tools): update taos-tools

fix: invalid idx

3.0