Cmdpal extension: Powertoys extension for cmdpal (#44006)

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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

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## PR Checklist

- [ ] Closes: #xxx
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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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## 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/PackageIdentity/AppxManifest.xml

@@ -10,7 +10,8 @@
   xmlns:desktop="http://schemas.microsoft.com/appx/manifest/desktop/windows10"
   xmlns:uap10="http://schemas.microsoft.com/appx/manifest/uap/windows10/10"
   xmlns:systemai="http://schemas.microsoft.com/appx/manifest/systemai/windows10"
-  IgnorableNamespaces="uap uap2 uap3 rescap desktop uap10 systemai">
+  xmlns:com="http://schemas.microsoft.com/appx/manifest/com/windows10"
+  IgnorableNamespaces="uap uap2 uap3 rescap desktop uap10 systemai com">
   <Identity
     Name="Microsoft.PowerToys.SparseApp"
     Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US"
@@ -30,6 +31,7 @@
     <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.19000.0" MaxVersionTested="10.0.26226.0" />
   </Dependencies>
   <Capabilities>
+    <Capability Name="internetClient" />
     <rescap:Capability Name="runFullTrust" />
     <systemai:Capability Name="systemAIModels"/>
     <rescap:Capability Name="unvirtualizedResources"/>
@@ -66,5 +68,42 @@
         AppListEntry="none">
       </uap:VisualElements>
     </Application>
+    <Application Id="PowerToys.CmdPalExtension" Executable="Microsoft.CmdPal.Ext.PowerToys.exe" EntryPoint="Windows.FullTrustApplication">
+      <uap:VisualElements
+        DisplayName="PowerToys.CommandPaletteExtension"
+        Description="PowerToys Command Palette Extension"
+        BackgroundColor="transparent"
+        Square150x150Logo="Images\Square150x150Logo.png"
+        Square44x44Logo="Images\Square44x44Logo.png"
+        AppListEntry="none">
+      </uap:VisualElements>
+      <Extensions>
+        <com:Extension Category="windows.comServer">
+          <com:ComServer>
+            <com:ExeServer Executable="Microsoft.CmdPal.Ext.PowerToys.exe" Arguments="-RegisterProcessAsComServer" DisplayName="PowerToys Command Palette Extension">
+              <com:Class Id="7EC02C7D-8F98-4A2E-9F23-B58C2C2F2B17" DisplayName="PowerToys Command Palette Extension" />
+            </com:ExeServer>
+          </com:ComServer>
+        </com:Extension>
+        <uap3:Extension Category="windows.appExtension">
+          <uap3:AppExtension Name="com.microsoft.commandpalette"
+            Id="PowerToys"
+            PublicFolder="Public"
+            DisplayName="PowerToys"
+            Description="Surface PowerToys commands inside Command Palette">
+            <uap3:Properties>
+              <CmdPalProvider>
+                <Activation>
+                  <CreateInstance ClassId="7EC02C7D-8F98-4A2E-9F23-B58C2C2F2B17" />
+                </Activation>
+                <SupportedInterfaces>
+                  <Commands/>
+                </SupportedInterfaces>
+              </CmdPalProvider>
+            </uap3:Properties>
+          </uap3:AppExtension>
+        </uap3:Extension>
+      </Extensions>
+    </Application>
   </Applications>
-</Package>
+</Package>