[w3c/IndexedDB] Apply [SameObject] IDL extended attribute to relevant attributes (#194)

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

* IDBObjectStore's `transaction`
* IDBIndex's `objectStore`
* IDBTransaction's `db`

Although semantically "same object" I don't think we can apply it in these cases per IDL's rules.

* IDBRequest and IDBCursor's `source` - it's a nullable union
* IDBObjectStore and IDBIndex's `keyPath` - it is `any` and defined in prose as effectively `(DOMString or sequence<DOMString>)` (nullable for stores)


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