[Core] Change OLED task function to be boolean (#14864)

* [Core] Add kb level callbacks to OLED driver

* Update keyboards and keymaps

* Update docs

* Update userspace configs

* Add fix for my keymap ...

* update lefty

keyboards/chidori/keymaps/oled_sample/keymap.c

@@ -210,8 +210,9 @@ void oled_write_layer_state(void) {
     }
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
     // If you want to change the display of OLED, you need to change here
     oled_write_layer_state();
+    return false;
 }
 #endif