[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/rpbaptist/keymap.c

@@ -290,7 +290,7 @@ void render_status(void) {
 #    endif
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
     if (timer_elapsed32(oled_timer) > OLED_TIMEOUT) {
         oled_off();
         return;
@@ -310,6 +310,7 @@ void oled_task_user(void) {
             }
         #endif
     }
+    return false;
 }
 #endif