Consider using Zig as a C/C++ compiler to enable cross-compilation scenarios

I noticed that DNNE doesn't currently support cross-compilation for all the usual reasons that cross-compilation is a nightmare.

The [Zig](https://ziglang.org) compiler supports cross-compilation out of the box across a wide range of platforms, and it contains an embedded Clang along with libc headers and/or sources for many platforms, allowing you to use `zig cc`/`zig c++` as a C/C++ compiler. Cross-compilation basically Just Works. This is one of the reasons I developed my [Zig SDK](https://docs.vezel.dev/zig-sdk) project.

It seems to me that using the Zig compiler as a C/C++ compiler for DNNE would be a ~perfect fit.

(FWIW, if this seems like a sensible thing to do, you could make use of the [Zig toolset packages](https://www.nuget.org/packages?q=vezel.zig.toolsets) I publish on NuGet with every Zig release.)

Look at how DNNE currently invokes the C/C++ compiler for native exports. Investigate the Zig SDK and its toolset packages on NuGet to understand how to integrate `zig cc`/`zig c++` as a cross-compiler. Check the build scripts or project files in the repository to see where compiler toolchains are configured. The goal is to modify the build process to optionally use Zig for cross-compilation scenarios.

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