[whatwg/streams] Question: Should Streams have the prototype for `Symbol.toStringTag` and `toString` declared? (#952)

In certain implementations of whatwg streams, I've come across them not implementing `toString` or `Symbol.toStringTag` on the prototype meaning that if you're trying to find out if you've been given a stream (or another data type) then you have to rely on duck typing.

In the following, I'd expect to see `"[object ReadableStream]"` returned:
```js
let r = new ReadableStream()
// ReadableStream {}
r.toString()
// "[object Object]"
> Object.prototype.toString.call(r)
// "[object Object]"
```

In Safari these all return as I'd expect, in Chrome and Firefox they return `"[object Object]"`. The spec doesn't actually specify the toString behavior.

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