[VS Code] Support for Apps in Workspaces

Currently the VS Code extension, like the CLI, expects that the folder open in VS Code is the root of your app project. However, users commonly have open a workspace in VS Code, or the root of a repository, where the app code may be one directory deep. Further, some repos contain several applications in one code base. It feels a little bit clunky as the user to have to open VS Code with my app project directory for WinApp CLI commands and the reopen VS Code to the root of my repo to see git changes, etc. It could make sense to adjust the VS Code Extension to offer support for setting an app directory config. So commands can be run from the root of the repo but applied to the app project 1+ directories deep.