Allow SocietyOfMind agent to work with function calling and tools.

[afourney]

Why are these changes needed?

Resolves #1553, and adds tests to ensure it doesn't break again.

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

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (3e33a2c) 35.28% compared to head (7ac93b9) 65.30%.

Files	Patch %	Lines
autogen/agentchat/contrib/society_of_mind_agent.py	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1569       +/-   ##
===========================================
+ Coverage   35.28%   65.30%   +30.02%     
===========================================
  Files          44       44               
  Lines        5311     5324       +13     
  Branches     1231     1305       +74     
===========================================
+ Hits         1874     3477     +1603     
+ Misses       3283     1515     -1768     
- Partials      154      332      +178     

Flag	Coverage Δ
unittests	65.27% <0.00%> (+29.98%)	⬆️

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[qingyun-wu]

Looks good!