feat: add streaming/cancellable API

[achingbrain]

Upgrades to the latest interface-datastore which includes streaming APIs and passing AbortControllers.

Uses the new Adapter class to implement these with minimal code changes.

• Splits out open so it's not called from the constructor any more
• Combines some of the private methods to make code flow simpler
• Removes code duplicated by the interface adapter

[hugomrdias]

im confused but the removal of batch, query and close

[hugomrdias]

everything comes from Adapter?

[achingbrain]

That's right, everything's moved up into the adapter as there's quite a bit of duplication across the datastore implementations.

The adapter batch is a little slower because it does the puts, then the deletes, but the previous one in this repo did everything together in an unbounded Promise.all which could either swamp the process or leave the repo in an inconsistent state if you were puting and deleteing the same key.