Establish connection between Erlang and Zig

[EduardoLR10]

These changes make the minimum amount of code to accomplish the following:

• Zig and Erlang can exchange messages to some degree by leveraging Erlang's communication protocol;
• The client code has Raylib access;
• Most of the tooling is being handled by Nix (exception for raylib-zig bindings which are not in Nix packages yet, hence we are using Zig's package manager to make it work.