adding streamlit sample app

[husseinkorly]

• New Streamlit sample app using autogen
• README added on how to run it
• Here what it looks like:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.59%. Comparing base (b562626) to head (b5568ac).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5306   +/-   ##
=======================================
  Coverage   70.59%   70.59%           
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  Files         180      180           
  Lines       11668    11668           
=======================================
  Hits         8237     8237           
  Misses       3431     3431           

Flag	Coverage Δ
unittests	70.59% <ø> (ø)

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[ekzhu]

Looks great! I think as next step we can mirror the chainlit #5304 changes to:

1. enable streaming, and tool use.
2. add an example for chatting with a team.