Summary: These changes allow replying to any notifications that offer quick reply text fields (like WhatsApp). Does work for WhatsApp. Does not work for Telegram.

Reviewers: #kde_connect, albertvaka

Reviewed By: #kde_connect, albertvaka

Subscribers: albertvaka

Maniphest Tasks: T4674

Differential Revision: https://phabricator.kde.org/D5991