[w3c/IndexedDB] add appendFile capability to overcome nedb performance-bottleneck (#260)

nedb emulates appendFile by re-saving its entire database as a blob to indexedb whenever a row insert/delete/update is performed [1].  this performance-hit makes it impractical for persisting largish datasets (> 20mb).

adding some kind of incremental appendFile feature would help.

[1] https://github.com/louischatriot/nedb/blob/v1.6.0/browser-version/browser-specific/lib/storage.js#L49

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