UIKit: Context menu for widgets in Hierarchy

[eprikazchikov]

Is your feature request related to a problem? Please describe.

As user of UI Editor I would like to be able to Rename/Duplicate/Delete widgets from context menu Hierarchy.

Describe the solution you'd like

Please add this ability for UI Editor as it was done in Main Scenes editor.

Describe alternatives you've considered

n/a

Additional context

n/a