[Win] Create AV1 D3D12 video encode accelerator

First pass implementation of the D3D12VideoEncodeAV1Delegate.

Bug: 40275246
Change-Id: I97b1185e3d9ef04addd9b10b4e3b7ed4e68fc70b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6103168
Reviewed-by: Jianlin Qiu <jianlin.qiu@intel.com>
Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
Commit-Queue: Yingying Ma <yingying.ma@intel.com>
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1427603}