Deliver chainHead_storage items progressively
#1605
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Close #1600
This PR refactors
SyncService::storage_queryto return aStorageQuerystruct that must be advanced progressively by the API user.This allows knowing the items as soon as they are obtained from the networking, and allows interrupting requests before all the results have been obtained.
As such, the implementation of
chainHead_storagewas updated to do exactly that.