GLES sRGB extensions allows for a texture to be respecified, with say
the sRGB_override extension, which will require us to reinterpret the
data in the texture in sRGB colorspace (or linear depending on the
format of the texture).

If the underlying ICD supports VK_KHR_image_format_list extension we
create a texture's backing VkImage with the
VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT enabled since we already know the
format we might need to reinterpret the texture as.

Bug: angleproject:3609
Bug: angleproject:4561
Bug: angleproject:5281
Change-Id: Ia4bed596ed3000f8af1a8fd73fb8e6c2cb9b5d6e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2513110
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>