VisualShader: Add options to frame multiple node groups from right click menu

[Foyezes]

Adding an option to frame multiple selected nodes from the right click menu, instead of having to create a new frame and dragging the nodes in.

[tetrapod00]

There is already a full-fledged proposal for this: #9868. I'm going to close this discussion and consolidate into that proposal. Thanks for taking the time to submit this!