Add snapshot generator #86
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This PR adds a snapshot generator, which touches all rows of the table to be snapshoted in batches, triggering replication WAL events for all rows that will then sync the data downstream.
The functionality used for snapshoting is naive, similar to what's currently done during the backfilling stage of pgroll.
The snapshot generator is an individual component that will be used by follow up PRs.
Relates to #80.