Docs/update latest feature

* [TD-5136]<feature>: taosdemo simulate real senario.

* update test case according to taosdemo change

* adjust range of semi-random data.

* make demo mode use different tag name and value.

* change malloc to calloc for pid allocation.

* fix typo.

* fix binary length default value and group id logic.

* fix help msg.

* fix aggregation func test.

* minor typo fix.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

[TD-2573]<feature>: ceil, floor and round functions are supported

[TD-7857]<doc>:add missing connectors

[TD-5641] <docs>: fix parameter bufsize format in UDF.

Update queryTestCases.py

[TD-2569] <docs>: SESSION & STATE window can not work with super table.

Update docs.md

update some picture number

Test/td 6635 d

enable crash_gen test

[TD-5641] <docs>: fix parameter format in UDF related SQL commands.

Solve the problem of picture typesetting in English and Chinese documents.

alter some image links

[TS-242] <docs>: describe datatype change in JDBC connector.

alter the image link

difference of jdbcType between 2.0.24 and later