fix: avoid invalid vgroup id

fix:  crash caused by elect null and issues found in asan

fix: crash caused by stream fill

test: crash_gen auto run for whole day 

fix: init/free SBatchDeleteReq for tsma

docs: add TDengine Knowledge Map

test: add asan case

fix [ASAN] memory leak while tdbRealloc

doc: updated contribution guidelines

test:run cast function in query mode 4

fix: avoid invalid check

* docs: update csharp connector status

* docs: fix csharp ws bulk pulling

* docs: clarify database param is optional to websocket dsn

* docs: fix python version and a few typos

* docs: fix jdbc version in connector matrix

refactor(sync): del wal in multi-replicas

test:add testcase of enterprise installPackages

test: add asan case

fix: fix error for select count(c2),count(ts) from table caused by null ts column aggregation

fix(query): fix some memory leaks.

fix: free the batch create table reqs' decoded comment field