OpenTelemetry GenAI Utilities

The `opentelemetry-util-genai` package provides boilerplate and helper functions to standardize instrumentation for Generative AI applications within the OpenTelemetry Python ecosystem. It aims to minimize the effort required to instrument GenAI libraries by offering standardized approaches for generating spans, metrics, and events. The library is currently in a beta development stage (v0.3b0) and is part of the larger `opentelemetry-python-contrib` project, with ongoing updates and a focus on evolving semantic conventions.