Important

Refactors Langfuse client to centralize mask function management in LangfuseResourceManager for consistent span handling.

• Behavior:
  • Moves mask function from Langfuse client class to LangfuseResourceManager singleton for centralized management.
  • Adds new mask parameter (type: MaskFunction) to LangfuseResourceManager class for resource-level control.
  • Ensures consistent masking behavior across all spans using the same public key.
  • Prevents potential inconsistencies by sharing mask function through resource manager singleton.
• Code Changes:
  • Updates Langfuse class in client.py to use LangfuseResourceManager for mask function.
  • Modifies LangfuseSpanWrapper in span.py to utilize the centralized mask function.
  • Adjusts tests in test_core_sdk.py and test_otel.py to reflect changes in mask function handling.

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