Add Button to Save All USD Layers as a Different Type

[Ziethriel]

Is your feature request related to a problem? Please describe.
There seems to be no way to save a USD file in the USD Layer Editor as a different type without making a change. Since there's no way to directly edit USD files in Maya, I want to be able to save as ASCII to perform those changes with a simple text editor. Then I want to re-save all the layers as Binary for performance. Sometimes when making a change so I can undo it to re-save the file as an ASCII file will still write an empty "over" statement that impacts assets in scope.

Describe the solution you'd like
I'd like a re-save all as type button in the USD Layer Editor Option drop down menu.

Describe alternatives you've considered
I've considered writing a script that would make an edit and remove it from all the layers and then save, but that's definitely not optimal.