[lvgl] Add on_change event (#7939)

esphome/components/lvgl/defines.py

@@ -168,6 +168,7 @@ LV_EVENT_MAP = {
     "READY": "READY",
     "CANCEL": "CANCEL",
     "ALL_EVENTS": "ALL",
+    "CHANGE": "VALUE_CHANGED",
 }
 
 LV_EVENT_TRIGGERS = tuple(f"on_{x.lower()}" for x in LV_EVENT_MAP)

tests/components/lvgl/lvgl-package.yaml

@@ -165,6 +165,11 @@ lvgl:
               - Nov
               - Dec
             selected_index: 1
+            on_change:
+              then:
+                - logger.log:
+                    format: "Roller changed = %d: %s"
+                    args: [x, text.c_str()]
             on_value:
               then:
                 - logger.log: