feat: add env filter to fetch_traces() and fetch_observations()

[marcklingen]

Important

Adds environment filtering to fetch_traces() and fetch_observations() in client.py, maintaining backward compatibility.

• Behavior:
  • Added environment parameter to fetch_traces() and fetch_observations() in client.py for filtering by environment.
  • Maintains backward compatibility with existing method signatures.
• Logging:
  • Updated debug logs in fetch_traces() and fetch_observations() to include environment parameter.

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Greptile Summary

Disclaimer: Experimental PR review

Added environment filtering capabilities to the fetch_traces() and fetch_observations() methods in the Langfuse Python client, enabling filtering of traces and observations by environment.

• Added optional environment parameter to fetch_traces() and fetch_observations() methods in /langfuse/client.py
• Environment parameter allows filtering traces and observations based on specified environments
• Implementation includes proper type hints and validation for environment filtering
• Maintains backward compatibility with existing method signatures

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[greptile-apps]

LGTM

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