Re: [w3c/IndexedDB] Add an Observer API (#51)

> Note that Google Firestore actually implemented their own cross tab communication system handle notifications. Not sure how they did it.

@burtonator I did the same for [RxDB](https://rxdb.info/) with the BroadcastChannel API. Because BroadcastChannel is [widely supported](https://caniuse.com/broadcastchannel) since 2022, I think most use cases for IndexedDB observer can be solved by just emitting BroadcastChannel events across browser tabs.

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