Add maxRegexStringLen  explaination.

Update docs.md

[no merge]test for CHANGE_FORK

[TD-11094][TD-6677][TD-10789][TD-12389]<test>:add taosdemo shell test case

[TD-12344]<test> add test case for coredump when session 

[TD-11970] <test> add case for TD-11970

[TD-11256] <test> add case for TD-11256

[TD-12163] <test> add case for TD-12163

* [TD-11842]<fix>: split taos-tools from TDengine tar.gz

* fix taos-tools version

* disable install_avro() in install.sh

* update makeclient.sh and deb/rpm script.

* update taos-tools commit

* update commit to fix taosdemo/taosdump

* missed $ in shell.

* fix taos missed in makeclient.sh

* fix typo

Fix/td 12261 fix describe json length error & fix memory leak & charset convert risk

* [TD-12102]<fix>:csharp support fetch_lengths,fix fetch_row binray retrieve error

* submit testcase

* fix method name to FetchLengths, update test case to assert value

* fix format

* ci 2nd

* fix bug long time convert timestamp when negative value

* add test description

TD-12344: fix session window for two stage super table query

[TD-12276]<fix>: elapsed nest query: Return a negative calculation result

<doc>[TD-12385] add json doc