Summary:
Store PendingIntents from notification actions. Send list of notifications to desktop and trigger Intent when matching packet arrives.
CCBUG: 366475

Test Plan: Create test notification, trigger package is received correctly. Whether intent.send() is actually successful is NOT yet tested.

Reviewers: #kde_connect, sredman

Reviewed By: #kde_connect, sredman

Subscribers: sredman, apol, MatMaul, kdeconnect, mtijink, #kde_connect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D12294