Allow conditions for diffing by adding a where_condition parameter to macros

[TongLin-atWork]

Describe the feature

For testing macros under "Compare which columns differ" section, it will be very useful to add an extra parameter where_conditions to filter out the data we really want to test on, for example where timestamp > 'date', in an incremental model, so that we can save the credits we spend on these testing queries.

Additional context

This can be used across all databases.

Who will this benefit?

Anyone who want to have the flexibility to test on a certain conditions and save money.

Are you interested in contributing this feature?

This is a quick one to add

[github-actions]

This issue has been marked as Stale because it has been open for 180 days with no activity. If you would like the issue to remain open, please comment on the issue or else it will be closed in 7 days.