Add perplexity model family

[marcorosa]

Added

• perplexity's sonar and sonar-pro models in AI Core are now supported

[github-actions]

The changes introduced in the llm.py file expand support for new AI models within a framework. Perplexity AI models are now integrated and compatible with the existing OpenAI completion API. This expansion enables users to utilize different model options under the Perplexity umbrella, broadening the selection available in AI applications without altering the user interface.

Walkthrough

• New Feature: Added support for Perplexity AI models (sonar, sonar-pro) within the existing API infrastructure, facilitating broader model compatibility and choices for users.
• Documentation: Minor comments improved to specify compatibility of Mistral and IBM models with the OpenAI completion API.
• Style: Code comments have been rearranged for clearer readability and context on model compatibility.

_{Model: gpt-4o | Prompt Tokens: 519 | Completion Tokens: 154}

[github-actions]

Here's a friendly code review powered by AI assistance. These suggestions are helpful insights rather than definitive answers, so please take what resonates with your project goals. You're the expert on your code—AI simply offers another perspective to support your development process. Feel free to adapt, modify, or set aside any recommendations based on what serves your work best.

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_{Model: anthropic--claude-4-sonnet | Prompt Tokens: 1231 | Completion Tokens: 885}