Add new deepeval tests in library

This update enhances the integration between ValidMind and DeepEval by introducing primary scorers within a dedicated deepeval namespace. You can now evaluate large language model (LLM) outputs using standardized metrics. Primary scorers are essential tools for evaluating LLM outputs. We have added several DeepEval-based LLM scorers, including:

• Hallucination
• Contextual precision/recall
• Summarization
• Task completion

Additionally, a demo notebook is available to guide you through end-to-end usage. Improvements have also been made to plots, such as boxplots, and examples.

DeepEval Integration with ValidMind