MVKImage track VkImageFormatListCreateInfo::pViewFormats
and validate MVKImageView format against them.
Add MVKImage::getMTLTextureUsage() and move tests for dedicated aliasables,
compressed formats, and minimum image usage into it.
Add MVKMTLFormatDesc::mtlPixelFormatLinear and
MVKPixelFormats::compatibleAsLinearOrSRGB()
to track linear counterparts to each Metal sRGB format.
Don't use MTLTextureUsagePixelFormatView if image will only
allow views that use same format or its sRGB/linear variation.
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