Eagerly Compile Imported Code

[jonnyboyC]

As of today Laythe compiles code just before it attempts to run it. In most cases this will occur nearly immediately but as an example say we have these two modules

main.lay

10000.times().iter().each(() => {
  // slow operation
});

import self.lib:{foo}

lib.lay

let bar = 10;

export let foo = bard + 1; // compile error unknown symbol

In laythe today we would indicate the compiler error once we hit the import after the slow operation. Ideally we want to warn of these issues as quickly as possible.