fix(os): win iconv find error

docs: reorganize and refine functions page in 3.0

fix(tmq): auto unsubscribe when consumer close

fix: the role should be OFFLINE after mnode stopped

fix: the max number of mnodes is limited to 3

fix(os): delete two win ctest

feat: tsma refactor

fix: close cause flush result error

fix(query): fix leastsquares column+null and with group by output has empty result

test : add test case for statedurcation and statecount

result

TD-16136

Enh/support tag flt

feat(tmq): support drop cgroup

feat: scheduler based on load

test: add schemaless-taosc-insert testcases to CI

enh: support tag filter

fix(parser): extract db name