[lvgl] Add lvgl.widget.focus action and related triggers. (#7315)

tests/components/lvgl/lvgl-package.yaml

@@ -54,6 +54,17 @@ lvgl:
       long_press_time: 500ms
   pages:
     - id: page1
+      on_load:
+        - logger.log: page loaded
+        - lvgl.widget.focus:
+            action: restore
+      on_unload:
+        - logger.log: page unloaded
+        - lvgl.widget.focus: mark
+      on_all_events:
+        logger.log:
+          format: "Event %s"
+          args: ['lv_event_code_name_for(event->code).c_str()']
       skip: true
       layout:
         type: flex
@@ -70,6 +81,10 @@ lvgl:
             repeat_count: 10
             duration: 1s
             auto_start: true
+            on_all_events:
+              logger.log:
+                format: "Event %s"
+                args: ['lv_event_code_name_for(event->code).c_str()']
         - label:
             id: hello_label
             text: Hello world
@@ -229,6 +244,16 @@ lvgl:
               - label:
                   text: Button
             on_click:
+              - lvgl.widget.focus: spin_up
+              - lvgl.widget.focus: next
+              - lvgl.widget.focus: previous
+              - lvgl.widget.focus:
+                  action: previous
+                  freeze: true
+              - lvgl.widget.focus:
+                  id: spin_up
+                  freeze: true
+                  editing: true
               - lvgl.label.update:
                   id: hello_label
                   bg_color: 0x123456