[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/armand1m/keymap.c

@@ -130,7 +130,8 @@ void oled_render_amsterdam_flag(void) {
     oled_write_raw_P(amsterdam_flag, sizeof(amsterdam_flag));
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
     oled_render_amsterdam_flag();
+    return false;
 }
 #endif // OLED_ENABLE