docs: add novita ai integration

[MizukiMoon]

Important

Adds documentation for integrating Novita AI with Langfuse using OpenAI drop-in replacement, including setup and example usage.

• Documentation:
  • Adds integration_novitaai.md to cookbook.
  • Provides a guide for integrating Novita AI with Langfuse using OpenAI drop-in replacement.
• Integration Steps:
  • Install openai and langfuse packages.
  • Set up environment variables for Langfuse and Novita AI API keys.
  • Use langfuse.openai for OpenAI client with Novita AI API key and base URL.
• Example:
  • Demonstrates calling Novita AI's chat model with Langfuse tracing.
  • Shows how to view API call traces in Langfuse, including request parameters and latency metrics.

^{This description was created by for fca3ea6. It will automatically update as commits are pushed.}

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[jannikmaierhoefer]

Hi @MizukiMoon, thank you for the contribution!