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

enh: refact some messages

test: add asan python case

test: add asan python case

enh(taosx): split block when none column not match

refactor: do some internal refactor, and update the logs.

fix: [ASAN] devive by zero