fix ImportFromModule is unhashable issue

[zcipod]

This fix makes the conversion to string prior to the deduplication to avoid this issue

Why are these changes needed?

When create user defined functions, an exception occurs because of the deduplication of ImportFromModule
This fix makes the conversion to string prior to the deduplication to avoid this issue

Related issue number

Closes #3361

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.

[thinkall]

Thank you @zcipod for the PR! LGTM.

[thinkall]

Could you please fix the type check error? Thanks.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 25.89%. Comparing base (6279247) to head (f68c644).
Report is 99 commits behind head on main.

Files	Patch %	Lines
autogen/coding/func_with_reqs.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3362      +/-   ##
==========================================
- Coverage   32.90%   25.89%   -7.02%     
==========================================
  Files          94      101       +7     
  Lines       10235    10752     +517     
  Branches     2193     2456     +263     
==========================================
- Hits         3368     2784     -584     
- Misses       6580     7673    +1093     
- Partials      287      295       +8     

Flag	Coverage Δ
unittest	12.10% <0.00%> (?)
unittests	25.13% <0.00%> (-7.78%)	⬇️

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[zcipod]

Could you please fix the type check error? Thanks.

Sorry for late response.
Type annotation for global_imports has been added
thanks @thinkall

[thinkall]

Hi @zcipod , could you please run pre-commit to fix the code format issue? Thanks. https://microsoft.github.io/autogen/docs/contributor-guide/pre-commit

[zcipod]

Hi @jackgerrits @qingyun-wu,

Could you please have a review of this PR? Thanks!