Validate llm_model format in ModuleLLM

[Harsh-617]

Fixes #88

Adds early validation for llm_model format and a unit test for this case.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.35%. Comparing base (379c4d8) to head (0f60b85).
⚠️ Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   87.61%   88.35%   +0.73%     
==========================================
  Files          19       19              
  Lines        1405     1425      +20     
==========================================
+ Hits         1231     1259      +28     
+ Misses        174      166       -8     

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[wang-boyu]

LGTM. Merging.