Tests: coverage for application/llm/* and application/llm/handlers/* ; fix on parsers/test_markdown

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  * coverage for openai, anthropic and googleai llms
  * coverage for llm/handlers/*

• Why was this change needed? (You can also link to an open issue here)

• Other information:
  fixed test_markdown_token_chunking_via_max_tokens

 Coverage XML written to file coverage.xml
=========================== short test summary info ============================
FAILED tests/parser/file/test_markdown_parser.py::test_markdown_token_chunking_via_max_tokens - AssertionError: assert 1 > 1
 +  where 1 = len([(None, 'abcdefghij')])
================== 1 failed, 125 passed, 6 warnings in 46.33s ==================

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.61%. Comparing base (2621395) to head (7d8ed2d).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1991      +/-   ##
==========================================
+ Coverage   28.27%   31.61%   +3.34%     
==========================================
  Files         107      107              
  Lines        8482     8484       +2     
==========================================
+ Hits         2398     2682     +284     
+ Misses       6084     5802     -282     

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