[w3c/IndexedDB] Update usage of StructuredClone (#135)

The spec abstractly references the _structured clone_ algorithm, e.g. _Let clone be structured clone of value..._ - this should be updated to use the **StructuredClone(_input_,_targetRealm_)** syntax from [[HTML]](https://html.spec.whatwg.org/multipage/infrastructure.html#structuredclone).

* [put()](https://w3c.github.io/IndexedDB/#dom-idbobjectstore-put), [add()](https://w3c.github.io/IndexedDB/#dom-idbobjectstore-add) and [update()](https://w3c.github.io/IndexedDB/#dom-idbcursor-update) should call StructuredClone() explicitly using the current Realm
* [Object Store Retrieval Operations](https://w3c.github.io/IndexedDB/#object-store-retrieval-operation), [Index Retrieval Operations](https://w3c.github.io/IndexedDB/#index-retrieval-operation) and [Cursor Iteration Operation](https://w3c.github.io/IndexedDB/#index-retrieval-operation) should take a _targetRealm _and use it when calling StructuredClone(); callers should pass the current Realm



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