Support string based UDFs

[jackgerrits]

Why are these changes needed?

• This is intentionally undocumented since I am not certain about the interface and want tinyra and ag studio to try it first

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 84.90566% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 49.70%. Comparing base (dd61eaa) to head (f57d5fb).
Report is 4 commits behind head on main.

Files	Patch %	Lines
autogen/coding/func_with_reqs.py	84.31%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2195       +/-   ##
===========================================
+ Coverage   37.97%   49.70%   +11.73%     
===========================================
  Files          75       77        +2     
  Lines        7587     7757      +170     
  Branches     1634     1798      +164     
===========================================
+ Hits         2881     3856      +975     
+ Misses       4463     3582      -881     
- Partials      243      319       +76     

Flag	Coverage Δ
unittest	14.34% <43.39%> (?)
unittests	48.63% <84.90%> (+10.68%)	⬆️

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[gagb]

checking it now!

[gagb]

worked for me! Let's get this merged soon!

[gagb]

Small comment: currently all function modules get stored in work_dir. It would be useful if I could provide a custom path within work_dir to use. The reason is that UDFs create a file per function so the number of files in work_dir increases rapidly. In an end app could be displaying files from work_dir to users;

[jackgerrits]

Small comment: currently all function modules get stored in work_dir. It would be useful if I could provide a custom path within work_dir to use. The reason is that UDFs create a file per function so the number of files in work_dir increases rapidly. In an end app could be displaying files from work_dir to users;

It should only be a single file for all functions - could you provide more details about when you saw multiple?