feat(query): add to_unixtimestamp function

TD-14243

test: fix the where sim case

enh(test): optimize the multi-threaded exit mode of tsim

test: fix having sim case

fix: grant feature.

* [TD-13558]<feature>: taos shell refactor

add taosTools as submodule

* add tools/taos-tools

* add more client interface for taosTools compile

* update taos-tools

* update taos-tools

* refactor shell

* [TD-13558]<feature>: taos shell test speed

* [TD-13558]<feature>: taos -n startup works

* taos -n rpc works

* taos -n server works

* cleanup code since no endPort in 3.0

* update taos-tools

* [TD-13558]<feature>: taos -C works

* improve taos shell -c WIP

* update taos-tools

* add demoapi.c

fix compile error

fix: make mul dir error.

feat(query): add to_iso8601 function

feat(query): child table or normal table support JOIN-clause

TD-14243

fix(query): handle crash of taosd caused by a complex expression in GROUP BY clauses.

enh: add tag filter

test: add having sim case

fix: is_null expression returned an incorrect result

fix(cluster): get monitor info in multi-process mode

* [TD-13558]<feature>: taos shell refactor

add taosTools as submodule

* add tools/taos-tools

* add more client interface for taosTools compile

* update taos-tools

* update taos-tools

* refactor shell

* [TD-13558]<feature>: taos shell test speed

* [TD-13558]<feature>: taos -n startup works

* taos -n rpc works

* taos -n server works

* cleanup code since no endPort in 3.0

* update taos-tools

* [TD-13558]<feature>: taos -C works

* improve taos shell -c WIP

* update taos-tools

feat(query): add cast function

fix(query): load the null data in nchar/binary columns.