[INSTRUMENTOR] Add support for Groq

[Sigmabrogz]

Description

Add auto-instrumentation support for Groq - the fastest LLM inference provider.

Why

Groq offers incredibly fast inference. Many developers use it for latency-sensitive applications.

Implementation Guide

1. Create src/agentdbg/instrumentors/groq_instrumentor.py
2. Groq uses OpenAI-compatible API, so this should be straightforward
3. Add to auto_instrument()
4. Add tests and example

Resources

• Groq Python SDK
• Very similar to OpenAI SDK

Good First Issue

Since Groq is OpenAI-compatible, this is one of the easiest instrumentors to add!