fix(langchain): do not stringify metadata unnecessarily

[hassiebp]

Important

Fixes metadata serialization in Langchain by preventing unnecessary string conversion, ensuring accurate data handling.

• Behavior:
  • Modified _flatten_and_serialize_metadata in attributes.py to preserve string and integer values without additional JSON serialization.
  • Prevents double-serialization of string values in Langchain user quotes, improving data accuracy.
• Tests:
  • Updated test_core_sdk.py to verify metadata handling without unnecessary string conversion.
  • Updated test_otel.py to ensure metadata is not double-serialized and is correctly handled in various scenarios.

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Greptile Summary

Disclaimer: Experimental PR review

Fixes metadata serialization in Langchain integration by preventing unnecessary string value conversion. This change addresses issues where string metadata values were being double-serialized in user quotes.

• Modified _flatten_and_serialize_metadata in langfuse/_client/attributes.py to preserve string and integer values without additional JSON serialization
• Prevents double-serialization of string values in Langchain user quotes, improving data accuracy

[greptile-apps]

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