Important

Add tracing_enabled parameter to conditionally initialize tracing in LangfuseResourceManager and Langfuse client.

• Behavior:
  • Add tracing_enabled parameter to LangfuseResourceManager and Langfuse constructor.
  • Modify _initialize_instance() in resource_manager.py to conditionally initialize tracer and span processor based on tracing_enabled.
  • In client.py, pass tracing_enabled to LangfuseResourceManager and use NoOpTracer if tracing is disabled.
• Misc:
  • Update LangfuseResourceManager.__new__() to default tracing_enabled to True if not specified.

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