Support ES modules

The runtime currently handles commonjs modules - and if an import statement is encountered the application will crash.

The implementation is currently in ModuleInternal.mm

It would be awesome if es modules were supported, since v8 already supports them - we are just missing the implementation for loading them (same-ish logic as for commonjs)

A reduced example for supporting es modules: https://stackoverflow.com/a/52031275/2270725

The gist of it is - we have to call ScriptCompiler::CompileModule on the source

Local<Module> module;
if (!ScriptCompiler::CompileModule(isolate, &source).ToLocal(&module)) {
  // if you have a v8::TryCatch, you should check it here.
  return;
}

Unresolved questions:

• Can the runtime support both types and interop between them?

ModuleInternal.mm から始め、既存の commonjs の読み込み経路を追跡し、提供されている ScriptCompiler::CompileModule の例と比較してください。V8 モジュールの読み込みと commonjs の相互運用がどのように機能すべきかを調査してください。import 文でクラッシュが発生しなくなり、ランタイムが両方のモジュール型の意図された相互作用をサポートすれば完了です。