Add ability to run Swift tutorials in VS Code

[rbenegal]

Is your feature request related to a problem? Please describe.
Many users who install the VS Code swift extension could be new to Swift and programming in general. A tutorial mode that will show features of the programming language could allow users to experiment with their programs interactively and greatly enhance their learning experience. This tutorial mode can include examples from the Swift Book, a VS Code version of the DocC tutorials, swift-testing tutorials and code formatting tutorials using swift-format.

Describe the solution you'd like
The feature can possibly be implemented with VS Code Walkthrough mode or something similar to the CodeTour extension.

Expected outcomes/benefits/deliverables

• A better onboarding experience for users who want to learn more about Swift
• Users learn about the features of the Swift programming language