feat: add custom Pydantic question schema support

[sumukshashidhar]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.15789% with 27 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@a66c2ac). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
yourbench/utils/schema_prompt_generator.py	87.73%	13 Missing ⚠️
yourbench/utils/parsing_engine.py	68.75%	10 Missing ⚠️
yourbench/pipeline/question_generation/_core.py	75.00%	2 Missing ⚠️
yourbench/utils/question_models.py	91.66%	1 Missing ⚠️
yourbench/utils/schema_loader.py	96.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage        ?   52.45%           
=======================================
  Files           ?       32           
  Lines           ?     2852           
  Branches        ?        0           
=======================================
  Hits            ?     1496           
  Misses          ?     1356           
  Partials        ?        0           

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