[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/palette1202/keymaps/key-check/keymap.c

@@ -142,10 +142,11 @@ bool encoder_update_user(uint8_t index, bool clockwise) {
 
 // OLED Display
 #ifdef OLED_ENABLE
-void oled_task_user(void) {
+bool oled_task_user(void) {
   render_row(0, "TEST");
   render_row(1, "test");
   render_row(2, "TEST");
   render_row(3, "test");
+    return false;
 }
 #endif // #ifdef OLED_ENABLE