[Refactor]Port C++/CX to C++/WinRT (#34198)

## Summary of the Pull Request
Removes all C++/CX code, replacing it with C++/WinRT.

## Detailed Description of the Pull Request / Additional comments
Removes all C++/CX code.
Renames interop namespaces to be better consumed by CsWinRT.
Standardizes all projects on net8.0-windows10.0.20348.0, which is a
requirement for C++/WinRT usage.
FileLocksmithLibInterop brought to stdcpplatest and static analysis
errors were corrected.
Removed now unneeded string conversion code from
FileLocksmithLibInterop.
Changed interop KeyboardHook to use a single hook across all instances.
Required because on C++/WinRT we don't have the .NET runtime to bind a
object instance to a delegate and be able to pass it to a C function
pointer argument (still no idea why this worked correctly on C++/CX to
be honest). This change actually makes us create less low level keyboard
hooks.
Changed some code that depended on arrays since WinRT/C++ returns null
instead of an empty array through the interface.

## Validation Steps Performed
Built and tested runtime.

src/modules/peek/Peek.Common/Peek.Common.csproj

@@ -22,6 +22,7 @@
   </ItemGroup>
 
   <ItemGroup>
+      <PackageReference Include="Microsoft.Windows.CsWinRT" />
       <PackageReference Include="Microsoft.Windows.CsWin32">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

src/modules/peek/Peek.FilePreviewer/Peek.FilePreviewer.csproj

@@ -30,6 +30,7 @@
   </ItemGroup>
 
   <ItemGroup>
+      <PackageReference Include="Microsoft.Windows.CsWinRT" />
       <PackageReference Include="CommunityToolkit.Mvvm" />
       <PackageReference Include="CommunityToolkit.WinUI.Converters" />
       <PackageReference Include="Microsoft.WindowsAppSDK" />

src/modules/peek/Peek.UI/PeekXAML/App.xaml.cs

@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using interop;
 using ManagedCommon;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -15,6 +14,7 @@ using Peek.FilePreviewer.Models;
 using Peek.UI.Native;
 using Peek.UI.Telemetry.Events;
 using Peek.UI.Views;
+using PowerToys.Interop;
 
 namespace Peek.UI
 {