[whatwg/streams] ReadableStream.prototype.text(), .blob(), and .bytes() (PR #1311)

Adds utility methods to akin to the Body mixin for fully reading the contents of a ReadableStream as either text, a Blob, or a Uint8Array.

This is a first pass at addressing #1019 ....

In this, I add only the `text()`, `bytes()`, and `blob()` methods. `text()` returns a promise for UTF-8 decoded text, `bytes()` returns a promise for a `Uint8Array`, and `blob()` returns a promise for a `Blob`. It is modeled heavily on the fetch spec `Body` mixin definitions with a few tweaks.

Refs: https://github.com/whatwg/streams/issues/1019

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1311

-- Commit Summary --

  * ReadableStream.prototype.text(), .blob(), and .bytes()

-- File Changes --

    M index.bs (120)

-- Patch Links --

https://github.com/whatwg/streams/pull/1311.patch
https://github.com/whatwg/streams/pull/1311.diff

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