Enhance the ModelAPI Class to Support JSON Schema Outputs

[chakravarthik27]

Issue Description:

The current implementation of the ModelAPI class in Langtest lacks robust support for generating and validating JSON schema outputs. Enhancing this functionality is essential to ensure better compatibility with structured data workflows, improved validation, and seamless integration with other components that rely on JSON schemas.

Proposed Solution:

1. Add methods to generate JSON schemas from the model's output data structure.
2. Implement validation logic to ensure the model's outputs conform to the defined JSON schema.
3. Provide clear error reporting for mismatches between the model's outputs and the expected schema.
4. Include unit tests to validate the new functionality.
5. Update documentation to describe the usage of JSON schema support in ModelAPI.

Benefits:

• Improved data integrity and compatibility.
• Enhanced reliability for structured data tasks.
• Easier debugging and validation of model outputs.

Acceptance Criteria:

• ModelAPI supports generating JSON schemas for its outputs. #1167
• Outputs are validated against the JSON schema with clear error messages for violations.
• Unit tests are added and pass successfully.
• Documentation is updated to reflect the new feature.