[IndexedDB] Ways to detect database manual deletions (#73)

Now we cannot detect database deletions by users because indexeddb does not dispatch onversionchange events in that case. So when we fail to create transactions(`DOMException: Failed to execute 'transaction' on 'IDBDatabase': The database connection is closing`), we cannot know whether databases connections were closed, or databases were deleted. Could you add the way to know that to the spec?

My implementation is here:

https://github.com/falsandtru/localsocket
https://github.com/falsandtru/localsocket/blob/master/src/layer/infrastructure/indexeddb/model/access.ts

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https://github.com/w3c/IndexedDB/issues/73