[AudioSystem] Allow audio engines to provide widgets for modifying connection properties. (#6303)

Signed-off-by: Maxim Ivanov <imginimg@gmail.com>

Gems/AudioSystem/Code/Include/Editor/IAudioSystemEditor.h

@@ -16,6 +16,8 @@
 
 #include <ACETypes.h>
 
+class QWidget;
+
 namespace AudioControls
 {
     class IAudioSystemEditor;
@@ -150,6 +152,12 @@ namespace AudioControls
 
         //! Informs the plugin that the ACE has saved the data in case it needs to do any clean up.
         virtual void DataSaved() = 0;
+
+        //! Creates a widget for modifying connection properties.
+        //! The widget must have a "PropertiesChanged()" signal.
+        //! The widget ownership transferred to the caller.
+        virtual QWidget* CreateConnectionPropertiesWidget([[maybe_unused]] const TConnectionPtr connection,
+            [[maybe_unused]] EACEControlType atlControlType) { return nullptr; }
     };
 
 } // namespace AudioControls