EXPERIMENTAL: zig-for-macos distributed as an npm package

This is just the files from this tarball wrapped up in an npm package.

See the Zig github repo and website for further information about Zig.

TODO

automate creation of this, maybe
- see https://github.com/ziglang/zig-pypi/ for inspiration
make versions of this package for every platform
- see https://github.com/evanw/esbuild/tree/e608c549df157b1ef344490ecec56b4c4965ab27/npm for inspiration
expose the zig binary as a node binary
- if so, maybe have a postinstall script to replace it with the actual binary? like esbuild does