[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/splitkb/kyria/keymaps/via/keymap.c

@@ -191,7 +191,7 @@ bool encoder_update_user(uint8_t index, bool clockwise) {
 #endif
 
 #ifdef OLED_ENABLE
-void oled_task_user(void) {
+bool oled_task_user(void) {
     if (is_keyboard_master()) {
         // QMK Logo and version information
         // clang-format off
@@ -244,5 +244,6 @@ void oled_task_user(void) {
         // clang-format on
         oled_write_raw_P(kyria_logo, sizeof(kyria_logo));
     }
+    return false;
 }
 #endif