Support for incremental loading

[lwbayes]

Hi dear developers,

Just wondering if this plugin supports some form of incremental loading like many other embulk plugins do.

The use case is like this: we need to incrementally load data from a event-sourcing based REST Api. The events have a auto-incrementing unique id that we can use for incremental loading. We want to be able to only load the new events since last load, by reading and writing the largest unique id from the most recent loading in a config file. Is it possible to achieve this with the plugin? If not, can you recommend some workaround, if possible? Thank you!