OpenTelemetry Threading Instrumentation

This library provides instrumentation for Python's built-in `threading` module, ensuring that OpenTelemetry trace context is correctly propagated across threads. It does not produce telemetry data on its own but facilitates the linking of spans across different threads. Currently in beta (version 0.61b0), it is part of the `opentelemetry-python-contrib` project, which maintains a frequent release cadence.