[android] Emit defaultActivated when tapping the notification
Summary: When the user taps a notification the corresponding activity is launched. By emitting a signal we allow the app to react to this, e.g. open the right conversation in a chat app.
Test Plan: untested
Reviewers: Frameworks, vkrause
Reviewed By: vkrause
Subscribers: kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D27239