Added basic support for Windows App Actions. (#39927)

## Summary of the Pull Request
Adds basic support for finding, listing, and executing Windows App
Actions on files found by the Microsoft.CmdPal.Ext.Indexer extension.

## PR Checklist

- [X] **Closes:** #39926
- [X] **Communication:** I've discussed this with core contributors
already. If work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [X] **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

## Detailed Description of the Pull Request / Additional comments
We also update cswin32 to stable version.

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Validated that it doesn't show on older versions of Windows (<26100
insiders) and that it does work on newer version that have the App
Actions runtime.

---------

Co-authored-by: Gordon Lam (SH) <yeelam@microsoft.com>
Co-authored-by: Mike Griese <migrie@microsoft.com>
Co-authored-by: Leilei Zhang <leilzh@microsoft.com>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Apps/Programs/UWPApplication.cs

@@ -221,11 +221,10 @@ public class UWPApplication : IProgram
             var capacity = 1024U;
             PWSTR outBuffer = new PWSTR((char*)(void*)Marshal.AllocHGlobal((int)capacity * sizeof(char)));
             var source = $"@{{{packageFullName}? {parsed}}}";
-            void* reserved = null;
 
             try
             {
-                PInvoke.SHLoadIndirectString(source, outBuffer, capacity, ref reserved).ThrowOnFailure();
+                PInvoke.SHLoadIndirectString(source, outBuffer.AsSpan()).ThrowOnFailure();
 
                 var loaded = outBuffer.ToString();
                 return string.IsNullOrEmpty(loaded) ? string.Empty : loaded;
@@ -235,7 +234,7 @@ public class UWPApplication : IProgram
                 try
                 {
                     var sourceFallback = $"@{{{packageFullName}?{parsedFallback}}}";
-                    PInvoke.SHLoadIndirectString(sourceFallback, outBuffer, capacity, ref reserved).ThrowOnFailure();
+                    PInvoke.SHLoadIndirectString(sourceFallback, outBuffer.AsSpan()).ThrowOnFailure();
                     var loaded = outBuffer.ToString();
                     return string.IsNullOrEmpty(loaded) ? string.Empty : loaded;
                 }