MM-56082 Add PreferencesHaveChanged plugin hook (#25659)

* Add interface for PreferencesHaveChanged hook

* Add context to preference-related methods of App

* Implement PreferencesHaveChanged

* Re-add missing "fmt" import

* Update minimum server version for the new hook

* Remove pointers to be consistent with other preference APIs

server/public/plugin/hooks_timer_layer_generated.go

@@ -264,3 +264,9 @@ func (hooks *hooksTimerLayer) OnSharedChannelsPing(rc *model.RemoteCluster) bool
 	hooks.recordTime(startTime, "OnSharedChannelsPing", true)
 	return _returnsA
 }
+
+func (hooks *hooksTimerLayer) PreferencesHaveChanged(c *Context, preferences []model.Preference) {
+	startTime := timePkg.Now()
+	hooks.hooksImpl.PreferencesHaveChanged(c, preferences)
+	hooks.recordTime(startTime, "PreferencesHaveChanged", true)
+}