Allow custom name for functions module

[jackgerrits]

Why are these changes needed?

This allows the module name to be overridden. For example, AutoGen Studio will probably use skills

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

Attention: Patch coverage is 28.57143% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 28.69%. Comparing base (6ca4785) to head (f7c5661).

Files	Patch %	Lines
autogen/coding/local_commandline_code_executor.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2241      +/-   ##
==========================================
- Coverage   37.94%   28.69%   -9.25%     
==========================================
  Files          77       77              
  Lines        7780     7784       +4     
  Branches     1666     1805     +139     
==========================================
- Hits         2952     2234     -718     
- Misses       4579     5291     +712     
- Partials      249      259      +10     

Flag	Coverage Δ
unittest	14.36% <28.57%> (?)
unittests	27.63% <28.57%> (-10.30%)	⬇️

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[gagb]

Thank you! This is very useful!