Prompt user to select devcontainer config when more than one available.

[tinydogio-joshua]

Hello,

I was wondering if we could get a similar flow as the one outlined here for codespaces allowing the user to select a devcontainer config when more than one is available.

https://github.com/devcontainers/spec/issues/100#issuecomment-1253942193

Spec Reference

https://github.com/devcontainers/spec/blob/main/docs/specs/devcontainer-reference.md#devcontainerjson