[whatwg/streams] add TrasformStream cancel (PR #1231)

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Closes https://github.com/whatwg/streams/issues/1212


The only thing left is what to do in case of the callback throwing/rejecting (and potentially somehow awaiting the callback? unsure if thats necessary).

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: …
   * Safari: …
   * Deno: https://github.com/denoland/deno/pull/14686

   * Node.js: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/streams/pull/1231


-- Commit Summary --

  * trasformstream cancel
  * fix

-- File Changes --

    M index.bs (29)

-- Patch Links --

https://github.com/whatwg/streams/pull/1231.patch

https://github.com/whatwg/streams/pull/1231.diff


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