[Feat] Improve exception mapping

[ishaan-jaff]

Better Exceptions for OpenAI compatible providers - You can see the provider name in the exception

• Perplexity AI API
• Mistral API
• Anyscale
• Xinference Embeddings
• Voyage AI Embeddings

exception:  PerplexityException - Traceback (most recent call last):
  File "/Users/ishaanjaffer/Github/litellm/litellm/llms/perplexity.py", line 349, in completion
    raise e
  File "/Users/ishaanjaffer/Github/litellm/litellm/llms/perplexity.py", line 292, in completion
    perplexity_client = perplexity(
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/perplexity/_client.py", line 98, in __init__
    raise perplexityError(
perplexity.perplexityError: The api_key client option must be set either by passing api_key to the client or by setting the PERPLEXITY_API_KEY environment variable

[railway-app]

This PR is being deployed to Railway 🚅

litellm: ◻️ REMOVED

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[ishaan-jaff]

@dhruv-anand-aintech added a test for the exact error you were seeing

[dhruv-anand-aintech]

That's awesome. Thanks!