Make the process implementation compatible with the async syntax

[R0DR160HM]

Using the async syntax when starting a process (and as consequence, when creating a new task too) is currently unsuported.

const pid = process.start<number, number>(async foo => foo * 2);
process.call(pid.subject!, 10, Infinity);

throws ERROR ReferenceError: __async is not defined.

For now, a recommended workaround is

const pid = process.start(foo => {
    return new Promise(resolve => {
        resolve(foo * 2);
    });
});
process.call(pid.subject!, 10 Infinity);