Summary: Add a runner that allows executing commands on a connected device. It enables a more keyboard-centric workflow than running the commands from the plasmoid.
Test Plan: Connect desktop device. Add some commands there. restart krunner, open it, start typing command or device name. Select entry to execute command. Check for success.
Reviewers: #kde_connect, #plasma, broulik, davidedmundson, apol
Reviewed By: #kde_connect, apol
Subscribers: apol, ngraham, kdeconnect
Tags: #kde_connect
Differential Revision: https://phabricator.kde.org/D14604
