AWS X-Ray Propagator for OpenTelemetry

The `opentelemetry-propagator-aws-xray` library provides an OpenTelemetry `TextMapPropagator` that enables propagation of trace context in AWS X-Ray compatible headers. It allows OpenTelemetry Python applications to integrate with existing AWS X-Ray traces by injecting and extracting the `X-Amzn-Trace-Id` header. The current version is 1.0.2, and it follows the release cadence of the broader `opentelemetry-python-contrib` project, which typically sees updates aligned with core OpenTelemetry Python releases.