This extension will allow the application to specify create and usage
flags used to create a Vulkan image that is being imported in GL.

Bug: angleproject:4912
Bug: fuchsia:52759
Change-Id: I635e87eaf8bb0797e474dd91b11d4b3779e9a3f3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2335018
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>