feat: enhance model handling with additional info and output schema s…

[chakravarthik27]

This pull request includes several changes to the langtest module, focusing on enhancing model initialization, handling additional model parameters, and updating dependencies. The most important changes include modifications to the __init__ and load_model methods to handle additional model information and output schemas, as well as updating the predict method to improve output parsing.

Enhancements to model initialization and parameter handling:

• langtest/langtest.py: Added logic to handle additional model information and parameters in the __init__ method. [1] [2] [3]

• langtest/modelhandler/llm_modelhandler.py: Introduced the output_schema parameter to the __init__ and load_model methods, and updated the exclude_args list to include output_schema. [1] [2] [3]

Improvements to output parsing and prediction:

• langtest/modelhandler/llm_modelhandler.py: Enhanced the predict method to incorporate output parsing using the output_schema parameter and updated the prompt configuration and model handling.

Dependency updates:

• pyproject.toml: Updated the langchain dependency version from 0.3.6 to ^0.3.15.