OpenTelemetry pymemcache Instrumentation

This library provides OpenTelemetry instrumentation for `pymemcache`, enabling automatic tracing of Memcached client operations. It is part of the `opentelemetry-python-contrib` project, which generally follows a monthly release cadence. As of version 0.62b0, the instrumentation libraries within `opentelemetry-python-contrib` are considered beta and may undergo breaking changes.