feat(client): allow setting additional headers

[hassiebp]

Important

Added support for custom HTTP headers in Langfuse Python client, allowing users to specify additional headers for API and OTLP requests.

• Behavior:
  • Added additional_headers parameter to LangfuseClient initialization in client.py.
  • Implemented header merging logic in resource_manager.py to ensure thread-safety.
  • Extended LangfuseSpanProcessor in span_processor.py to support custom headers in OTLP requests.
• Tests:
  • Added test_additional_headers_simple.py to verify additional headers functionality, including scenarios with custom and default HTTP clients.

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Greptile Summary

Disclaimer: Experimental PR review

Added support for custom HTTP headers in the Langfuse Python client, allowing users to specify additional headers for all API and OTLP requests.

• Added additional_headers parameter to LangfuseClient initialization in langfuse/_client/client.py
• Implemented header merging logic in langfuse/_client/resource_manager.py while maintaining thread-safety
• Extended LangfuseSpanProcessor in langfuse/_client/span_processor.py to support custom headers in OTLP requests

[greptile-apps]

LGTM

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