[w3c/IndexedDB] Apply [NewObject] IDL extended attribute to relevant methods (#193)

We can apply `[NewObject]` in the following cases:

* Any method that returns an IDBRequest or IDBOpenDBRequest, e.g. `get()` etc
* IDBDatabase `transaction()`
* `createObjectStore()`, `createIndex()`
* The statuc IDBKeyRange methods (`only()` etc)

This allows implementations to make assertions, but doesn't alter the behavior.

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