Move core samples to /python/samples

[ekzhu]

Moving all Python samples to a single place under python/samples, each with its own set of dependencies and instructions.

All python/packages/autogen-core/samples to /python/samples. Each sample is in its own directory, prefixed by core_ or agentchat_

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.14%. Comparing base (71a3b23) to head (f955fb5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4911   +/-   ##
=======================================
  Coverage   68.14%   68.14%           
=======================================
  Files         161      161           
  Lines       10185    10185           
=======================================
  Hits         6941     6941           
  Misses       3244     3244           

Flag	Coverage Δ
unittests	68.14% <ø> (ø)

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[jackgerrits]

I'm not sure if pyright etc covered samples before, but we should make sure they are covered

[ekzhu]

I'm not sure if pyright etc covered samples before, but we should make sure they are covered

This is done.