Add support for ctrl+k #11
Description
When the user presses ctrl+k, an input box should appear inline with the code that they were selecting. This is somewhat difficult to do because the vscode extension API alone doesn't support it - it requires creating a new component in the IDE.
We think we can modify vscode's built-in "codelens" or "zone widget" components to build the input box to ctrl+K, but we are open to alternatives like taking code from the "diffEditor".
