Provide support for the VS Code workspace type

[jgwerner]

Description

Sometimes content creators and instructors would like the flexibility to provide additional workspace types to their end-users.

This feature request's scope is focused on providing the VS Code as a workspace type option.

Solution

Offer the VS Code as an option with a workspace type selector when using the profile spawner.

Scope and Tasks

• This initial version does not provide support for Auto Grading features from within the VS Code. This may be dealt with at a future date by providing a VS Code compatible extension to hook into the existing grading artifacts.
• Document how to override the profile spawner's selector to spawn/access the workspace automatically with query parameters and/or LTI custom fields.