Follow up to #18953.
Implement all the DB migrations required for a progress bar.
The main change here is to support saving:
the estimated records/bytes at the sync level
the estimated records/bytes and emitted records/bytes at the stream level
After this, I'll put up a PR for the persistence layer changes, which will writing to and reading from these columns.
Finally, I'll wire this into the API changes, which are currently stubs.
- add the estimated_records and estimated_bytes columns to the SyncStats table.
- create a stream_stats table
- estimated and emitted records/bytes column
- contains attempt_id and stream_name columns. Unique constraints on these two columns.
- foreign key to the attempt_id table.
- this table hopefully sets us up for the parallel sync work.
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