geekdroid-firebase: allow to validate QueryPagingSource boundary key
This is useful when ordering by @ServerTimestamp field. When the document
hasn't been sent to server it can't be used as a boundary key has the server
timestamp is null. This change allows client to make the check and avoid an
IllegalArgumentException.
<!--
Geekdroid is a utility library for development on the Android
Platform.
Copyright (C) 2017-2024 by Frederic-Charles Barthelery.
This file is part of Geekdroid.
Geekdroid is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Geekdroid is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Geekdroid. If not, see <http://www.gnu.org/licenses/>.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android" />