Add an extension to provide the ability to specify the LUID of the
GPU adapter to use when using D3D11.

Corresponding chromium CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2096778

Bug: chromium:792657
Change-Id: Iefebea221a4b7a20f150b445ae1adf375444726d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2096663
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>