enh: optimize query msg

fix: avoid mem leak when taosd quit

test: add case for alter stb

refactor(query): set the block groupId for stream block.

docs: change city name

fix(query): fix unique function NULL value not hashable handling

enh: default ep set

enh: opt index mutex

fix: vnode pre-process

test：add test case for functions

test: modify case

TD-16034

docs: refine image alt text

test:add cluster testcase of electing leader and python connector using statement api

test: modify sleep value

feat(tmq): drop cgroup