The upcoming `AsyncContext` specification adds a default value and name
to async storage variables. This adds the same to `AsyncLocalStorage`
to promote closer alignment with the pending spec.
```js
const als = new AsyncLocalStorage({
name: 'foo',
defaultValue: 123,
});
console.log(als.name); // 'foo'
console.log(als.getStore()); // 123
```
Refs: https://github.com/tc39/proposal-async-context/blob/master/spec.html
PR-URL: https://github.com/nodejs/node/pull/57766
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
James M Snell