Add typical text based filtering rules (e.g. contains, does not contain, begins with, etc).

Example: in the stripe integration I would like to exclude all invoices where the "billing reason" is "subscription_cycle" and the "status" is "paid". This is because they are 95% of our invoices but we don't need to do any work on them.

Note: It is already possible to filter by "status=paid" 👍

Thanks!