Add recipe for the xNVMe system library and CLI

[safl]

This is useful in itself and also serves as a preparation for a Conda package for the xNVMe Python bindings, making the library available for the xNVMe Python module.

Question: the xNVMe library makes use of pwritev(), however, seems like on OSX then this is not available? The library is otherwise tested on OSX but only on macOS version 12, 13, and 14. For example: https://github.com/xnvme/xnvme/actions/runs/9777719238/job/27013889686 Is it possible to specify a significantly newer OSX version than 10? If possible, then I can change this recipe to enable OSX, otherwise, this would wait for me to add a pwritev() fallback in xNVMe which I would prefer not to.

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