Managed arguments

We're not limited to just using immutable types as function arguments, managed types also implement CCallArg. The function can just as easily take a Module or Value as an argument. If the argument type is Value, that argument's type is left unspecified in the generated function signature and passed to ccall as Any.

use jlrs::prelude::*;

fn print_module_name(module: Module) {
    let name = module.name();
    println!("{name:?}");
}

fn print_value(value: Value) {
    println!("{value:?}");
}

julia_module! {
    become julia_module_tutorial_init_fn;

    fn print_module_name(module: Module);
    fn print_value(value: Value);
}

julia> module JuliaModuleTutorial ... end
Main.JuliaModuleTutorial

julia> JuliaModuleTutorial.print_module_name(JuliaModuleTutorial)
:JuliaModuleTutorial

julia> JuliaModuleTutorial.print_value(JuliaModuleTutorial)
Main.JuliaModuleTutorial