Examples by topics

[qingyun-wu]

Why are these changes needed?

Categorize notebook examples by topics to make it easier for one to find relevant examples and demo.

More topics to be added later.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.39%. Comparing base (11df53b) to head (d2cf859).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1967   +/-   ##
=======================================
  Coverage   37.39%   37.39%           
=======================================
  Files          64       64           
  Lines        6913     6913           
  Branches     1518     1518           
=======================================
  Hits         2585     2585           
  Misses       4106     4106           
  Partials      222      222           

Flag	Coverage Δ
unittests	37.39% <ø> (ø)

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