[Bug]: FastAPI is required when not using litellm proxy and using Langfuse

[mumumumu]

What happened?

I'm using the LiteLLM Python SDK to integrate with Langfuse and I'm seeing an import error after recently bumping from version 1.37.9 to 1.43.10.

Based on the traceback, I believe it's due to this import.

Is this import necessary for people that aren't using the LiteLLM Proxy Server?

Relevant log output

web-1       | Traceback (most recent call last):
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/integrations/langfuse.py", line 523, in _log_langfuse_v2
web-1       |     log_provider_specific_information_as_span(trace, clean_metadata)
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/integrations/langfuse.py", line 679, in log_provider_specific_information_as_span
web-1       |     from litellm.proxy.proxy_server import premium_user
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/proxy/proxy_server.py", line 54, in <module>
web-1       |     raise ImportError(f"Missing dependency {e}. Run `pip install 'litellm[proxy]'`")
web-1       | ImportError: Missing dependency No module named 'orjson'. Run `pip install 'litellm[proxy]'`
web-1       |
web-1       | [14/Aug/2024 14:34:02] ERROR LiteLLM - Langfuse Layer Error - Traceback (most recent call last):
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/proxy/proxy_server.py", line 50, in <module>
web-1       |     import orjson
web-1       | ModuleNotFoundError: No module named 'orjson'
web-1       |
web-1       | During handling of the above exception, another exception occurred:
web-1       |
web-1       | Traceback (most recent call last):
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/integrations/langfuse.py", line 523, in _log_langfuse_v2
web-1       |     log_provider_specific_information_as_span(trace, clean_metadata)
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/integrations/langfuse.py", line 679, in log_provider_specific_information_as_span
web-1       |     from litellm.proxy.proxy_server import premium_user
web-1       |   File "/usr/local/lib/python3.12/site-packages/litellm/proxy/proxy_server.py", line 54, in <module>
web-1       |     raise ImportError(f"Missing dependency {e}. Run `pip install 'litellm[proxy]'`")
web-1       | ImportError: Missing dependency No module named 'orjson'. Run `pip install 'litellm[proxy]'`

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[ishaan-jaff]

fixed here :d8ef882