[AddPkg] zig

**Packages to add** - `zig`: A general-purpose programming language and toolchain for maintaining robust, optimal and reusable software. **Upstream** - `zig`: https://ziglang.org **Additional context** `Findllvm.cmake`: - [#L86](https://github.com/ziglang/zig/blob/e4cbd752c8c05f131051f8c873cff7823177d7d3/cmake/Findllvm.cmake#L86)