[whatwg/encoding] Add TextEncoderStream and TextDecoderStream transform streams (#149)

Integrate with the streams standard by adding TextEncoderStream and
TextDecoderStream transform streams to the standard. These enable
binary<>text conversions on a ReadableStream using the `pipeThrough()`
method (see https://streams.spec.whatwg.org/#rs-pipe-through).

A TextEncoderStream object can be used to transform a stream of strings
to a stream of bytes in UTF-8 encoding. A TextDecoderStream object can
be used to transform a stream of bytes in the encoding passed to the
constructor to strings.

There is a prollyfill and tests for the new functionality at
https://github.com/GoogleChromeLabs/text-encode-transform-prollyfill.

Closes #72.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/149

-- Commit Summary --

  * Add TextEncoderStream and TextDecoderStream transform streams

-- File Changes --

    M encoding.bs (499)

-- Patch Links --

https://github.com/whatwg/encoding/pull/149.patch
https://github.com/whatwg/encoding/pull/149.diff

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