Important

Add environment attribute propagation to span and generation methods in client.py and span.py.

• Behavior:
  • Add environment attribute propagation in start_span(), start_as_current_span(), _start_as_current_otel_span_with_processed_media(), update_current_span(), and update_current_trace() in client.py.
  • Add environment attribute to LangfuseSpan and LangfuseGeneration constructors in span.py.
• Classes:
  • LangfuseSpan and LangfuseGeneration now include environment in their initialization and attribute setting.
• Misc:
  • Update docstrings in span.py to include environment parameter.

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