add RPC semconv stable opt-in

based on https://github.com/open-telemetry/semantic-conventions/pull/3224

 Future Work (Out of Scope)

1. Deprecation timeline and eventual removal of old semconv: https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/15881
