Lightstep (OpenTracing - Deprecated)

The `lightstep` library provides the Python OpenTracing implementation for sending tracing data to Lightstep (now ServiceNow Cloud Observability). As of late 2020, Lightstep strongly recommends migrating to OpenTelemetry for all new and existing Python instrumentation, and this `lightstep-tracer-python` library is no longer the recommended approach. The current version is 4.4.8, but new development has shifted to OpenTelemetry-based solutions.