feat(test): make LVGL's test utilities public

lv_conf_template.h

@@ -1121,6 +1121,15 @@
 
 #endif
 
+/** Enable emulated input devices, time emulation, and screenshot compares. */
+#define LV_USE_TEST 0
+#if LV_USE_TEST
+
+/** Enable `lv_test_screenshot_compare`.
+ * Requires libpng and a few MB of extra RAM. */
+#define LV_USE_TEST_SCREENSHOT_COMPARE 0
+#endif /*LV_USE_TEST*/
+
 /** Enable loading XML UIs runtime */
 #define LV_USE_XML    0