feat(langchain): Support BaseCallbackManager

[szokeasaurusrex]

While implementing #4479, I noticed that our Langchain integration lacks support for the local_callbacks having type BaseCallbackManager, which according to the type hint is possible.

This change adds support for this case.

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Codecov Report

Attention: Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.

Project coverage is 80.66%. Comparing base (7804260) to head (d7efd46).
Report is 1 commits behind head on master.

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Files with missing lines	Patch %	Lines
sentry_sdk/integrations/langchain.py	68.42%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4486      +/-   ##
==========================================
- Coverage   80.69%   80.66%   -0.03%     
==========================================
  Files         156      156              
  Lines       16474    16487      +13     
  Branches     2799     2801       +2     
==========================================
+ Hits        13294    13300       +6     
- Misses       2298     2301       +3     
- Partials      882      886       +4     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/langchain.py	70.90% <68.42%> (+0.77%)	⬆️

... and 3 files with indirect coverage changes