Implement a basic remote FS
This MR implements a basic, read-only filesystem provider. This can be used to achieve a similar effect to the GitHub Remote Repositories extension. To provide a complete experience, additional work is needed, to add commands and hopefully integration with the VSCode remote system. The following is the result of adding gitlab-remote://gitlab.com/28521455/?ref=main
as a workspace:
Closes #411 (closed)
Edited by Ethan Reesor