Added macOS events for expand & collapse events (#21043)

* Added macOS events for expand & collapse events

* Fix CFString bridging to NSString

* Don't use ExpandCollapseProvider functions when event was not for ExpandCollapseProvider

---------

Co-authored-by: Adam Demasi <adam@hbang.com.au>
Co-authored-by: Julien Lebosquain <julien@lebosquain.net>

native/Avalonia.Native/src/OSX/automation.mm

@@ -509,8 +509,14 @@
             NSAccessibilityPostNotification(self, NSAccessibilitySelectedChildrenChangedNotification);
             break;
         case ToggleProvider_ToggleState:
+            NSAccessibilityPostNotification(self, NSAccessibilityValueChangedNotification);
+            break;
         case ExpandCollapseProvider_ExpandCollapseState:
             NSAccessibilityPostNotification(self, NSAccessibilityValueChangedNotification);
+            if (_peer->ExpandCollapseProvider_GetIsExpanded())
+                NSAccessibilityPostNotification(self, (__bridge NSString *)kAXRowExpandedNotification);
+            else
+                NSAccessibilityPostNotification(self, (__bridge NSString *)kAXRowCollapsedNotification);
             break;
         default:
             break;