feat(ios): add Ti.UI.SearchBar focused property

Fixes TIMOB-27711

Author: sgtcoolguy

iphone/Classes/TiUISearchBarProxy.m

@@ -237,6 +237,11 @@ - (void)removeTokenAtIndex:(id)index
 }
 #endif
 
+- (NSNumber *)focused
+{
+returnNUMBOOL([[selfsearchBar] isFirstResponder]);
+}
+
 USE_VIEW_FOR_CONTENT_HEIGHT
 @end