Java int type leads to overflow for large tables

[janblom]

Describe the bug
WhiteRabbit scan use Java type int for row based statistics, leading to a maximum of 2147483647 processable rows.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
WhiteRabbit should be able to handle larger row counts. Basically, switch from int to long, but be aware of related issues (overflowing calculations).

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):
All platforms/versions

Additional context
First reported on the OHDSI forums here.