RADV Wires Up VK_EXT_descriptor_buffer, VKD3D-Proton Usage Pending

Introduced last week as part of Vulkan 1.3.235 was the new VK_EXT_descriptor_buffer extension. NVIDIA issued a same-day Vulkan beta with support for this new capability while now the open-source Mesa Radeon Vulkan driver "RADV" has added support for it too and there is also VKD3D-Proton usage for this new extension pending...