Give the gist workspace a name

[cesaryuan]

Is your feature request related to a problem? Please describe.
The name of the workspace generated by clicking Open workspace as gist is /. When I use the Open Recent tool of VSCode, it is difficult to distinguish different gist, as shown in the figure.

Describe the solution you'd like
Name the workspace with the name of the gist, e.g. gistName [Gist], like the GitHub Repositories - Visual Studio Marketplace extension, it will name the workspace owner/repoName [Github].

Describe alternatives you've considered
No

Additional context
No