Re: [whatwg/streams] Rewrite to use Web IDL, and generally modernize (#1035)

Possible breaking change: the first argument of the constructors of ReadableStream, WritableStream and TransformStream is now compulsory.

Methods which take a dictionary will be stricter about what types they accept. For example `readable.getReader(true)` will no longer work.

An additional irrelevant change for queuing strategies: currently `new CountQueuingStrategy({highWaterMark: 'sandwich'}).highWaterMark` returns `"sandwich"`. After this change, it will return `NaN`.

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