Summary:
Allows other devices to make this device discoverable via a
kdeconnect.findmyphone.request command, if running.
Currently supports playing a sound.
Counterpart to FindMyPhone plugin
Test Plan:
Connect with other device running KDE Connect (with Plasmoid).
Select a working play sound in the Find My Device plugin settings.
On other device trigger Find My Phone button for this device in KDE Connect
Plasmoid and notice this device playing the configured sound.
Reviewers: #kde_connect, nicolasfella
Reviewed By: #kde_connect, nicolasfella
Subscribers: kdeconnect, sredman, mtijink, apol, nicolasfella
Tags: #kde_connect
Differential Revision: https://phabricator.kde.org/D11773
