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wstd::main doesn't set exit code on failure #109

@usergood

Description

@usergood

When using the #[wstd::main] i would expect that an error would set another exitcode than 0.
This beavior is the same right now as tokio::main in a none wasm-application.

Example usage:

use std::error::Error;
use wstd::http::{Body, Client,  Request};

#[wstd::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let request = Request::get("https://non-existing-url.example.com")
        .body(Body::empty())?;

    let _response = Client::new().send(request).await?;

    Ok(())
}

This will return Exit-code 0 when compiled to wasip2 through the wasi-run WIT-interface, and the error form the application will be throwed away between the wit-interface.
Is this the intended behavior?

For example right now i have to do this to make my "main" applications async

use std::error::Error;
use wstd::http::{Body, Client, Request};

fn main() {
    wstd::runtime::block_on(async move {
        if let Err(err) = async_main().await {
            eprintln!("{err}");
            std::process::exit(1);
        }
    });
}

async fn async_main() -> Result<(), Box<dyn Error>> {
    let request = Request::get("https://non-existing-url.example.com").body(Body::empty())?;

    let _response = Client::new().send(request).await?;

    Ok(())
}

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