[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/helix/rev2/keymaps/default/oled_display.c

@@ -208,7 +208,7 @@ void iota_gfx_task_user(void) {
     matrix_update(&display, &matrix);
 }
 #    else
-void oled_task_user(void) {
+bool oled_task_user(void) {
 
 #        if DEBUG_TO_SCREEN
     if (debug_enable) {
@@ -223,6 +223,7 @@ void oled_task_user(void) {
         render_rgbled_status(false);
         render_layer_status();
     }
+    return false;
 }
 #    endif
 #endif