[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/ungodly/launch_pad/keymaps/default/keymap.c

@@ -274,7 +274,7 @@ static void render_light_logo(void) {
   oled_write_raw_P(light_logo, sizeof(light_logo));
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
   switch (get_highest_layer(layer_state)) {
     case 0:
       render_rocket_logo();
@@ -290,5 +290,6 @@ void oled_task_user(void) {
       oled_write_ln_P(PSTR(" UND"), false);
       break;
     }
+    return false;
 }
 #endif