Cmdpal extension: Powertoys extension for cmdpal (#44006)

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

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## PR Checklist

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **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
Installer built, and every command works as expected,
Now use sparse app deployment, so we don't need an extra msix

---------

Co-authored-by: kaitao-ms <kaitao1105@gmail.com>

src/modules/Workspaces/WorkspacesCsharpLibrary/Utils/DashCaseNamingPolicy.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json;
+using WorkspacesCsharpLibrary.Utils;
+
+namespace WorkspacesCsharpLibrary.Utils;
+
+public class DashCaseNamingPolicy : JsonNamingPolicy
+{
+    public static DashCaseNamingPolicy Instance { get; } = new DashCaseNamingPolicy();
+
+    public override string ConvertName(string name)
+    {
+        return name.UpperCamelCaseToDashCase();
+    }
+}

src/modules/Workspaces/WorkspacesCsharpLibrary/Utils/FolderUtils.cs

@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.IO;
+
+namespace WorkspacesCsharpLibrary.Utils;
+
+public class FolderUtils
+{
+    public static string Desktop()
+    {
+        return Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
+    }
+
+    public static string Temp()
+    {
+        return Path.GetTempPath();
+    }
+
+    // Note: the same path should be used in SnapshotTool and Launcher
+    public static string DataFolder()
+    {
+        return Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\Microsoft\\PowerToys\\Workspaces";
+    }
+}

src/modules/Workspaces/WorkspacesCsharpLibrary/Utils/IOUtils.cs

@@ -0,0 +1,47 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.IO;
+using System.IO.Abstractions;
+using System.Threading.Tasks;
+
+namespace WorkspacesCsharpLibrary.Utils;
+
+public class IOUtils
+{
+    private readonly IFileSystem _fileSystem = new FileSystem();
+
+    public void WriteFile(string fileName, string data)
+    {
+        _fileSystem.File.WriteAllText(fileName, data);
+    }
+
+    public string ReadFile(string fileName)
+    {
+        if (_fileSystem.File.Exists(fileName))
+        {
+            int attempts = 0;
+            while (attempts < 10)
+            {
+                try
+                {
+                    using FileSystemStream inputStream = _fileSystem.File.Open(fileName, FileMode.Open);
+                    using StreamReader reader = new(inputStream);
+                    string data = reader.ReadToEnd();
+                    inputStream.Close();
+                    return data;
+                }
+                catch (Exception)
+                {
+                    Task.Delay(10).Wait();
+                }
+
+                attempts++;
+            }
+        }
+
+        return string.Empty;
+    }
+}

src/modules/Workspaces/WorkspacesCsharpLibrary/Utils/StringUtils.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Linq;
+
+namespace WorkspacesCsharpLibrary.Utils;
+
+public static class StringUtils
+{
+    public static string UpperCamelCaseToDashCase(this string str)
+    {
+        // If it's a single letter variable, leave it as it is
+        return str.Length == 1
+            ? str
+            : string.Concat(str.Select((x, i) => i > 0 && char.IsUpper(x) ? "-" + x : x.ToString())).ToLowerInvariant();
+    }
+}