[whatwg/dom] Add cloneable option to ShadowRootInit (Issue #1137)

Splitting this from declarative Shadow DOM discussion.

We should add `cloneable` boolean flag to `ShadowRootInit`, whose default is false. When this flag is set to true, [cloning](https://dom.spec.whatwg.org/#concept-node-clone) of the shadow host will clone the shadow root along with its descendants if *clone children flag* is set.

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