[whatwg/dom] Draft integration with Trusted Types, take 2. (PR #1247)

This calls the get Trusted Types-compliant attribute value algorithm from Trusted Types (https://github.com/w3c/trusted-types/pull/418) from attribute's change, append, and replace.

Changed the signature of `setAttribute` and `setAttributeNS` to accept Trusted Types as values. The underlying Attr node's values continue to be `DOMString`, so moving nodes across elements or adding standalone attributes to elements can cause TT violations. This matches WPT tests and the Chromium's implementation.

See  and #789. Supercedes PR #809.

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- [x] At least two implementers are interested (and none opposed):
   * Gecko
   * Chromium (already implemented)
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://github.com/web-platform-tests/wpt/tree/master/trusted-types
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=739170
   * Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1508286
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
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(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/dom/pull/1247

-- Commit Summary --

  * Draft integration with Trusted Types, take 2.

-- File Changes --

    M dom.bs (27)

-- Patch Links --

https://github.com/whatwg/dom/pull/1247.patch
https://github.com/whatwg/dom/pull/1247.diff

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