Re: [w3c/IndexedDB] Add a new event `onbeforecommit` on the interface IDBTransaction (#314)

It will be nicer to append the check like this:
```ts
function doDangerousAction1(t) {
   // ....
   t.addEventListener('beforecommit', e => assertDBConsistency(e, t))
}
```

Therefore I can enforce a consistency check before the transaction commit then abort the transaction if it goes into a invalid state.

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