feat(core): add support for observation events

[hassiebp]

Important

Adds support for Langfuse observation events with new LangfuseEvent class and create_event() method, along with refactoring in client.py and span.py.

• Behavior:
  • Adds create_event() method in client.py to create Langfuse observation events.
  • Introduces LangfuseEvent class in span.py for event-specific span handling.
  • Events are child spans of the current context span.
• Refactoring:
  • Makes create_trace_id(), _format_otel_span_id(), and _format_otel_trace_id() static methods in client.py.
  • Removes unused update_finished_trace() method in client.py.
• Span Types:
  • Extends LangfuseSpanWrapper to support event type spans in span.py.
  • Updates LangfuseSpanWrapper to handle event type in _set_processed_span_attributes() and other methods.

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Greptile Summary

Disclaimer: Experimental PR review

This PR adds support for observation events in the Langfuse Python SDK, integrating them with the existing OpenTelemetry-based tracing system and making several methods static for better efficiency.

• Added new LangfuseEvent class and create_event() method in langfuse/_client/span.py for handling event-type observations
• Made helper methods static (create_trace_id, _format_otel_span_id, _format_otel_trace_id) in langfuse/_client/client.py
• Removed ABC inheritance and @abstractmethod decorator from LangfuseSpanWrapper in langfuse/_client/span.py
• Added proper timestamp handling for events using time_ns() in langfuse/_client/client.py

[greptile-apps]

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