vkd3d: Enable extensions KHR_present_id and KHR_present_wait if supported.

To implement DXGI swapchain frame latency behaviour correctly requires these extensions. A latency of 3 should be applied to the swapchain by default and does not require a call to SetMaximumFrameLatency().

For the second commit, it's possible to instead add a generic function which queries support for extensions (probably from an enum). I doubt we'll find much need for it though.