Re: [whatwg/encoding] Fast byteLength() (Issue #333)

I suspect that this API might be used to determine the length of the buffer to use for `encodeInto()`, which it is not a good fit for, since it would iterate through the string twice unnecessarily. If we think it is useful to add this API, maybe we should also add another `maxByteLength` method that simply returns `3 * string.length`, to try and steer developers to the right usage patterns.

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