[whatwg/dom] Add the IDL of XSLTProcessor (#972)

Copied from https://wiki.whatwg.org/wiki/DOM_XSLTProcessor.

Part of https://github.com/whatwg/dom/issues/181.

- [x] At least two implementers are interested (and none opposed):
   * Already shipped for a very long time.
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://wpt.fyi/results/xslt/idlharness.tentative.window.html?run_id=5629877849948160&run_id=5674415519956992&run_id=5740158517248000&run_id=5649823409635328
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/972

-- Commit Summary --

  * Add the IDL of XSLTProcessor

-- File Changes --

    M dom.bs (28)

-- Patch Links --

https://github.com/whatwg/dom/pull/972.patch
https://github.com/whatwg/dom/pull/972.diff

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