Describe the pull request

This PR adds support for user-defined debug markers. Command queues now expose three additional methods for this purpose:

// Begin/End debug region:
void BeginDebugRegion(const String& label, const Vectors::ByteVector3& color);
void EndDebugRegion();

// Insert single debug marker:
void SetDebugMarker(const String& label, const Vectors::ByteVector3& color);

All three methods are optional and are only ever built for debug builds in the default backends. Additionally, the methods are only implemented for x64 builds in the DirectX 12 backend. If the methods are not available, they will no-op.

Under the hood, this PR introduces some additional changes to debugging. First of all, the DirectX 12 backend now uses the official WinPixEventRuntime, which is integrated as an overlay-port and loaded from NuGet. For this reason, vcpkg has been updated to version 2022.10.19. For the Vulkan backend, the extension VK_EXT_debug_utils is now enabled by default in debug builds.