i3-style:cargo macro rebuild

[BoatyPillow]

Summary rebuilt the package to support the new rust macros

Summary

added %cargo_build and cargo fetch to support the rebuild Test Plan

installed using eopkg, I do not have i3 installed so cannot fully test the package Checklist

• [X] Package was built and tested against unstable

[BoatyPillow]

Resolves getsolus/packages#3111

[androidnisse]

Resolves #3111

This will not resolve that one. There are others not fixed. And there is a bug open for this as well https://github.com/getsolus/packages/issues/3298