Initial DSC v3 support for PowerToys (#41132)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

Tasks checklist
- [X] Implement DSC infra in PowerToys
- [X] Implement Settings DSC resource
  - [X] Implement Get, Set, Test, Export, Schema
  - [X] Generate manifest (DSC resource JSON)
- [X] Added Unit Tests
- [x] Add `NJsonSchema` v11.4.0 to the stream
- [x] Package the manifest files so dsc.exe can discover them
- [x] Add `PowerToys.DSC.exe` to the PATH (maybe?)
- [x] Add `InstallLocation` in the registry key so `winget configue
export` can export the PowerToys DSC resources
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## PR Checklist

- [X] Closes: #37276
- [X] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [X] **Tests:** Added/updated and all pass
- [X] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** Added/updated
- [x] **New binaries:** Added on the required places
- [x] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [x] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [x] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [x] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [x] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

---------

Co-authored-by: vanzue <vanzue@outlook.com>
Co-authored-by: Kai Tao (from Dev Box) <kaitao@microsoft.com>
Co-authored-by: Leilei Zhang <leilzh@microsoft.com>

tools/build/build-installer.ps1

@@ -124,6 +124,20 @@ else {
     Write-Warning "[SIGN] No .msix files found in $msixSearchRoot"
 }
 
+# Generate DSC manifest files
+Write-Host '[DSC] Generating DSC manifest files...'
+$dscScriptPath = Join-Path $repoRoot '.\tools\build\generate-dsc-manifests.ps1'
+if (Test-Path $dscScriptPath) {
+    & $dscScriptPath -BuildPlatform $Platform -BuildConfiguration $Configuration -RepoRoot $repoRoot
+    if ($LASTEXITCODE -ne 0) {
+        Write-Error "DSC manifest generation failed with exit code $LASTEXITCODE"
+        exit 1
+    }
+    Write-Host '[DSC] DSC manifest files generated successfully'
+} else {
+    Write-Warning "[DSC] DSC manifest generator script not found at: $dscScriptPath"
+}
+
 RestoreThenBuild 'tools\BugReportTool\BugReportTool.sln' $commonArgs $Platform $Configuration
 RestoreThenBuild 'tools\StylesReportTool\StylesReportTool.sln' $commonArgs $Platform $Configuration