[w3c/IndexedDB] Add support for async update or another way to prepopulate the databade (#126)

AFAICT there is no way to ensure data has been added to the database during the update from one version to the next, since the update event is sync, not async. And this means there is also no way to do schema updates of existing data in the database (ie, get all entries, change them, and put them back again. 

Any chance this could be added? 

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