Add Metal Performance Shaders

[tbetcke]

Hi,

this is a draft pull request to add Metal Performance Shaders.

I am trying to add the MetalPerformanceShaders framework. I have followed some other PRs in how to add frameworks. But when I am running cargo run --bin header-translator I am getting the error message

─ERROR unknown unexposed attribute, name="MPS_ENUM_AVAILABLE_STARTING", fnlike=true

How do I update the libraries to deal with this? My progress so far is visible in this pull request.