[whatwg/encoding] Add get an encoder and encode or fail for URLs (#238)

Please excuse the branch name. The first commit is #237 and I will rebase this once @andreubotella has looked at that.

I suspect some changes might be needed here around my IO queue usage. In particular, in this scenario we probably do want to push end-of-queue upon encountering an error, to make conversion to bytes easier for the caller.


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  https://github.com/whatwg/encoding/pull/238

-- Commit Summary --

  * Reorganize hooks for standards
  * Add get an encoder and encode or fail for URLs

-- File Changes --

    M encoding.bs (193)

-- Patch Links --

https://github.com/whatwg/encoding/pull/238.patch
https://github.com/whatwg/encoding/pull/238.diff

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