[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/nullbitsco/nibble/keymaps/oled_status/keymap.c

@@ -51,11 +51,12 @@ oled_rotation_t oled_init_user(oled_rotation_t rotation) {
     return OLED_ROTATION_180;
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
     if (timer_elapsed(oled_timer) >= 3000) {
         set_oled_mode(OLED_MODE_IDLE);
     }
     render_frame();
+    return false;
 }
 #endif