OpenTelemetry Haystack Instrumentation

The `opentelemetry-instrumentation-haystack` library provides OpenTelemetry tracing capabilities for applications using Haystack (haystack-ai). It automatically captures spans for various Haystack operations, including pipeline execution, document store interactions, and LLM calls, enriching them with relevant attributes. As part of the `openllmetry` project, it follows its rapid release cadence, with version `0.58.0` being the latest, frequently updating to support new Haystack features and OpenTelemetry semantic conventions.