Support for zig packages in build.zig.zon

[figsoda]

It is currently not very well documented, but ziglang/zig#14290 is pretty self explanatory, as it just uses plain urls to tarballs and zip files.

Homepage: https://ziglang.org/

[KateCatlin]

Hi @figsoda, thank you so much for chiming in!

I'll leave this issue open in case other folks want to add 👍s for support here.