[heycam/webidl] Consider adding support in WebIDL for defining template tags (#631)

The ES6 feature of [tagged template strings](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals) has recently been catching on in JavaScript. We may want to add Web APIs which define template tags in the near future, e.g., [for  Trusted Types, to test literal-ness](https://github.com/WICG/trusted-types/issues/96) (cc @koto) or for a built-in version of something like the parsing part of [lit-html](https://github.com/polymer/lit-html) (cc @justinfagnani).

Would it make sense to add support to WebIDL to add template tags? What would that look like?

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