Returns the application's response to a snapshot offer.
See also the [`OfferSnapshot`] data type and the [ABCI state sync documentation][ssd].
[ABCI documentation](https://docs.tendermint.com/master/spec/abci/abci.html#offersnapshot)
[ssd]: https://docs.tendermint.com/master/spec/abci/apps.html#state-sync