[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/common/interop/Constants.h

@@ -0,0 +1,50 @@
+#pragma once
+#include "Constants.g.h"
+namespace winrt::PowerToys::Interop::implementation
+{
+    struct Constants : ConstantsT<Constants>
+    {
+        Constants() = default;
+
+        static uint32_t VK_WIN_BOTH();
+        static hstring AppDataPath();
+        static hstring PowerLauncherSharedEvent();
+        static hstring PowerLauncherCentralizedHookSharedEvent();
+        static hstring RunSendSettingsTelemetryEvent();
+        static hstring RunExitEvent();
+        static hstring FZEExitEvent();
+        static hstring FZEToggleEvent();
+        static hstring ColorPickerSendSettingsTelemetryEvent();
+        static hstring ShowColorPickerSharedEvent();
+        static hstring ShowAdvancedPasteSharedEvent();
+        static hstring AdvancedPasteMarkdownEvent();
+        static hstring AdvancedPasteJsonEvent();
+        static hstring ShowPowerOCRSharedEvent();
+        static hstring MouseJumpShowPreviewEvent();
+        static hstring AwakeExitEvent();
+        static hstring ShowPeekEvent();
+        static hstring PowerAccentExitEvent();
+        static hstring ShortcutGuideTriggerEvent();
+        static hstring RegistryPreviewTriggerEvent();
+        static hstring MeasureToolTriggerEvent();
+        static hstring GcodePreviewResizeEvent();
+        static hstring QoiPreviewResizeEvent();
+        static hstring DevFilesPreviewResizeEvent();
+        static hstring MarkdownPreviewResizeEvent();
+        static hstring PdfPreviewResizeEvent();
+        static hstring SvgPreviewResizeEvent();
+        static hstring ShowHostsSharedEvent();
+        static hstring ShowHostsAdminSharedEvent();
+        static hstring CropAndLockThumbnailEvent();
+        static hstring CropAndLockReparentEvent();
+        static hstring ShowEnvironmentVariablesSharedEvent();
+        static hstring ShowEnvironmentVariablesAdminSharedEvent();
+    };
+}
+
+namespace winrt::PowerToys::Interop::factory_implementation
+{
+    struct Constants : ConstantsT<Constants, implementation::Constants>
+    {
+    };
+}