[whatwg/webidl] add [[ErrorData]] slot to DOMExceptions (PR #1421)

This is an attempt to fix https://github.com/tc39/proposal-is-error/issues/9.

The intention is to make DOM Exceptions true subclasses of `Error`.

It's possible this PR needs additional changes to simplify/undo #732 - I'm happy to make whatever changes are appropriate.

- [ ] At least two implementers are interested (and none opposed):
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- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
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   * Gecko: …
   * WebKit: …
   * Deno: …
   * Node.js: …
   * webidl2.js: …
   * widlparser: …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
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This is part of a stage 2 TC39 proposal for `Error.isError`. When it advances to stage 2.7, I'll file the appropriate implementation bugs.


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  https://github.com/whatwg/webidl/pull/1421

-- Commit Summary --

  * add [[ErrorData]] slot to DOMExceptions

-- File Changes --

    M index.bs (1)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1421.patch
https://github.com/whatwg/webidl/pull/1421.diff

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