[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/handwired/owlet60/keymaps/oled_testing/keymap.c

@@ -66,7 +66,7 @@ oled_rotation_t oled_init_user(oled_rotation_t rotation) {
   //return OLED_ROTATION_180;
   return OLED_ROTATION_180;
 }
-void oled_task_user(void) {
+bool oled_task_user(void) {
   // Host Keyboard Layer Status
   /*oled_write_P(PSTR("Lyr: "), false);
   switch (get_highest_layer(layer_state)) {
@@ -92,5 +92,6 @@ void oled_task_user(void) {
     };
 
   oled_write_P(qmk_logo, false);
+    return false;
 }
 #endif