Prompt Flow Tracing

The `promptflow-tracing` package provides tracing capabilities for Prompt Flow, enabling the capture and visualization of internal execution processes for both DAG and Flex flows. It's designed to be compatible with OpenTelemetry, offering comprehensive observability for LLM-based applications, including those using frameworks like Langchain or OpenAI. The current version is 1.18.4, and the library is actively developed with frequent releases.