Refactoring winget/dsc services out of UI projects

[AmelBawa-msft]

Summary of the pull request

References and relevant issues

• Moved Windows Package Manager to a new csproj
• Decoupled DSC from Windows Package Manager and promoted to a separate csproj
• Rename IAppInstallManagerService to IMicrosoftStoreService
• Rename IWindowsPackageManager to IWinGet
• Use Microsoft.Extensions.Logging.ILogger instead of Serilog.ILogger in DevHome.Services.*
• Restructure DSC into services instead of a single helper file

graph TB;
    %%{init:{'flowchart':{"defaultRenderer": "elk"}}}%%
    subgraph Services["\n\n\n\nService projects:\n- UI agnostic\n- Mockable\n- Reusable"]
        Core
        WPM
        DSC
    end

    Core[Core]
    WPM[WindowsPackageManager]
    DSC[DesiredStateConfiguration]
    SF[SetupFlow]
    SFE[SetupFlowElevated]
    Common[Common]
    
    WPM --> Core
    DSC --> Core
    SF --> WPM
    SF --> DSC    
    SFE --> WPM
    SFE --> DSC
    Common --> Core

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Detailed description of the pull request / Additional comments

Validation steps performed

PR checklist

• Closes Refactor and share code between elevated and dev home processes #622
• Tests added/passed
• Documentation updated

[krschau]

You might want to rebase instead of merge... looks like your PR has pulled in previous changes, making it harder to see what changed here.

[krschau]

Suggest moving new stuff under Common in a separate change.
Also, you might want to create Debug_FailFast configs for the new projects