metal : support for Swift (#3078)
* Metal support for Swift
* update
* add a toggle for arm/arm64
* set minimum versions for all platforms
* update to use newLibraryWithURL
* bump version
Co-authored-by: Jhen-Jie Hong <iainst0409@gmail.com>
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Co-authored-by: Jhen-Jie Hong <iainst0409@gmail.com>
