Feat/eng 1413 alternate devcontainer

[pascalbreuninger]

feat(cli): add get-workspace-config command to resolve the source and multiple devcontainer files ahead of creation feat(ui): experimental setting for multi-devcontainer repos, disabled by default. Can check for multiple devcontainer.json files before creating a workspace, or manually enter devcontainer path (no checks will be done though) chore(ui): bump dependencies