llm exception handling

[cmungall]

• Adding docs on how to use different LLM models
• Adding exception handling to llm calls

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 76.07%. Comparing base (564f06f) to head (1f4792f).
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/oaklib/implementations/llm_implementation.py	33.33%	12 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #711      +/-   ##
==========================================
- Coverage   76.09%   76.07%   -0.03%     
==========================================
  Files         262      262              
  Lines       30371    30388      +17     
==========================================
+ Hits        23112    23118       +6     
- Misses       7259     7270      +11     

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