feat(fragment): deprecate lv_fragment (#9460)

docs/src/auxiliary-modules/fragment.rst

@@ -4,6 +4,10 @@
 Fragment
 ========
 
+.. warning::
+
+    This module is now deprecated and will be removed in an upcoming release.
+
 Fragment is a concept copied from
 `Android <https://developer.android.com/guide/fragments>`__.
 

src/others/fragment/lv_fragment.c

@@ -24,6 +24,7 @@ static void cb_delete_assertion(lv_event_t * event);
 
 lv_fragment_t * lv_fragment_create(const lv_fragment_class_t * cls, void * args)
 {
+    LV_LOG_WARN("lv_fragment is deprecated and will be removed in an upcoming release.");
     LV_ASSERT_NULL(cls);
     LV_ASSERT_NULL(cls->create_obj_cb);
     LV_ASSERT(cls->instance_size >= sizeof(lv_fragment_t));