Heavy background jobs of other apps pause while a backup runs

Reserved in Nextcloud's job list, so no app is turned off and a job that is running goes on.
At most 6 hours in a row, then they get an hour; Nextcloud ends a reservation by itself after
12 hours, should the end of a pause never come. On by default, with a setting to turn it off.

appinfo/info.xml

@@ -83,6 +83,7 @@ you need help with restoring a backup after a crash.]]></description>
         <command>OCA\NgBackup\Command\ListSnapshots</command>
         <command>OCA\NgBackup\Command\Browse</command>
         <command>OCA\NgBackup\Command\Restore</command>
+        <command>OCA\NgBackup\Command\PauseJobs</command>
         <command>OCA\NgBackup\Command\Pin</command>
         <command>OCA\NgBackup\Command\Note</command>
         <command>OCA\NgBackup\Command\Prune</command>

appinfo/routes.php

@@ -25,6 +25,7 @@ return [
 		['name' => 'AdminApi#setTargetLimit', 'url' => '/api/targets/{id}/limit', 'verb' => 'PUT'],
 		['name' => 'AdminApi#startBackup', 'url' => '/api/backups', 'verb' => 'POST'],
 		['name' => 'AdminApi#tick', 'url' => '/api/tick', 'verb' => 'POST'],
+		['name' => 'AdminApi#setPauseHeavyJobs', 'url' => '/api/settings/pause-heavy-jobs', 'verb' => 'PUT'],
 		['name' => 'AdminApi#setTargetSchedule', 'url' => '/api/targets/{id}/schedule', 'verb' => 'PUT'],
 		['name' => 'AdminApi#snapshots', 'url' => '/api/targets/{targetId}/snapshots', 'verb' => 'GET'],
 		['name' => 'AdminApi#setSnapshotNote', 'url' => '/api/targets/{targetId}/snapshots/{snapshotId}/note', 'verb' => 'PUT'],