fix: kwarg LlamaCppLLM.llm overwritten by import

[bruvduroiu]

Closes #206 .

Description of fix

A bug was introduced in #190 that overwrote the kwarg value of LlamaCppLLM.llm, replacing a passed kwarg instance of llama_cpp.Llama.

The same bug also replaced the passed value of LlamaCppLLM.grammar.

Fix

Rely on self._llama_cpp.{Llama,LlamaGrammar} if we need these classes, remove the overriding of llm and grammar from the values passed as kwargs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.14%. Comparing base (12af7a5) to head (f8caff1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
- Coverage   78.16%   78.14%   -0.02%     
==========================================
  Files          43       43              
  Lines        2235     2233       -2     
==========================================
- Hits         1747     1745       -2     
  Misses        488      488              

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