Docs/update latest feature

Bumps httpclient from 4.5.8 to 4.5.13.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpclient
  dependency-type: direct:production
...
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps httpclient from 4.5.4 to 4.5.13.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpclient
  dependency-type: direct:production
...
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

[TD-4557]fix mem leak issue

Test/td 4463

[TD-4505]<test>: add test case for last_row()

[TD-3963]async commit a msg to save config

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

modify smoketest.sh to python3.8

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

change focal to bionic.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

cherry pick from master.

* don't check maven on windows for appveyor.

* fix timezone build error with clang/linux.

* add .appveyor.yml back.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

Feature/query

merge from master

[TD-4043]fix bug in session window

[TD-1920]fix compact bug:sync sdb to disk when compact end

[TD-4394]add modify column,tag width implementation

[TD-4533] <docs>: fix description about func "taos_stmt_bind_param_ba…

[TD-4533] <docs>: describe C/C++ & Java version of Prepare Statement …

[TD-4523] add test case 

[TD-4395]update test-all.sh