[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

users/xulkal/custom_oled.c

@@ -176,7 +176,7 @@ static void render_status(void)
 
 #endif // OLED_90ROTATION
 
-void oled_task_user(void)
+bool oled_task_user(void)
 {
     if (is_keyboard_master())
         render_status();
@@ -185,4 +185,5 @@ void oled_task_user(void)
         render_logo();
         oled_scroll_left();
     }
+    return false;
 }