[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/crkbd/keymaps/gotham/oled.c

@@ -246,7 +246,7 @@ oled_rotation_t oled_init_user(oled_rotation_t rotation) {
     return OLED_ROTATION_270;
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
     if (timer_elapsed(oled_timer) > 10000) {
         oled_off();
         return;
@@ -262,4 +262,5 @@ void oled_task_user(void) {
     } else {
         render_status_secondary();
     }
+    return false;
 }