Add copy context menu action to REPL

[digeff]

Could you please add a copy button? Also trying to select some text, and scrolling to finish the selection, and then copying it doesn't seem to do what I'd expect it to do.

[isidorn]

When you say copying it you mean you pressed ctrl c? On what vscode version are you?
You would like a copy button in the context menu?

Also be aware of this limitation #2163

[digeff]

@isidorn Yes, what I'm reporting is related to the "virtual view". My suggestions are:

1. If you are using a virtual view you should use a virtual caret, so the virtual view is indistinguishable from a real view.
2. It'd be nice to have a Copy button, like you have for output channels

[isidorn]

1. already captured in Multi page selection in debug console #2163
2. changed the title of this issue to reflect this flaw