Use wizard-like flow for Dockerfile scaffolding #1642
Description
In a discussion about the Python scaffolding flow, an idea was brought up related to making the series of user prompts bi-directional, in case the user needed to correct a prompt or make a different choice. Currently the scaffolding flow is a series of independent prompts; the user can't go "back" without cancelling the entire commands.
VS Code does have a more complex form of the input/quick-pick APIs that allow for things such as back buttons, etc., which would allow us to move to a more user-friendly wizard-like flow. In fact, the vscode-azureextensionui library we use actually has a wrapper around that API that we could use as well.