[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/nullbitsco/nibble/keymaps/oled_bongocat/keymap.c

@@ -155,7 +155,7 @@ static void render_anim(void) {
     }
 }
 
-void oled_task_user(void) {
+bool oled_task_user(void) {
     render_anim();
     oled_set_cursor(0, 14);
 
@@ -168,6 +168,8 @@ void oled_task_user(void) {
     wpm_counter[1] = '0';
     wpm_counter[0] = '>';
     oled_write_ln(wpm_counter, false);
+
+    return false;
 }
 #endif