Show number of bytes scanned in check results

[janet-can]

From A Slack Community thread:

Q: Since Athena charges based on bytes scanned, I was hoping that in addition to displaying the time that a given check took, it would be possible to also show the number of bytes scanned (which seems to be part of the data returned by Athena queries).

A: The check execution info is generic and it currently has no data source specific info. The logging is consolidated in the core package, so it’s not straightforward to add data source specific info. Having said that we are looking at design changes that make this possible.

[jmarien]

SODA-1269