fix(bug): update model handling in OpenAI and AzureOpenAI configurations

[chakravarthik27]

This pull request includes several updates to the langtest/augmentation/utils.py file to enhance model configuration and validation logic. The most important changes include switching from validator to field_validator, adding a new model field to configuration classes, and dynamically setting the model name in template generation functions.

Updates to model configuration and validation:

• langtest/augmentation/utils.py: Changed import from pydantic.v1 to pydantic and replaced validator with field_validator for template validation. [1] [2]
• langtest/augmentation/utils.py: Added model field with default value "gpt-4o-mini" to OpenAIConfig and AzureOpenAIConfig classes. [1] [2]

Dynamic model name setting:

• langtest/augmentation/utils.py: Introduced model_name variable to dynamically set the model in generate_templates_azoi and generate_templates_openai functions, removing hardcoded model names. [1] [2] [3] [4]

Removal of redundant code:

• langtest/augmentation/utils.py: Removed the max_tokens parameter from the generate_templates_azoi and generate_templates_openai functions. [1] [2]

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