Teams Toolkit: Multi-root workspace support

[crewmanmud]

Is your feature request related to a problem? Please describe. The Teams Toolkit extension for VS Code doesn't support multi-root workspaces.

Describe the solution you'd like Support added for multi-root workspaces: https://github.com/microsoft/vscode/wiki/Adopting-Multi-Root-Workspace-APIs

Describe alternatives you've considered

• Multiple VS Code windows for each folder with Teams Toolkit being used.
• First folder in multi-root workspace is the one that needs Teams Toolkit

Additional context I had a search through this repo before raising and didn't find any issues/discussions indicating multi-root support had been implemented.

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