Define feed service in Eikon Python API

@johan.lundquist yes - for the streaming part it is as you correctly note the Websocket API - but Eikon/Workspace users now have access to new services on there such as Search, Historical Pricing (to replace get_timeseries with a better data model) and many other services. These have all been packaged up into the RDP library. That also contains a fully function Eikon Data API package inside so you can use both libs from one package. I hope this can help. Kindest regards, Jason