Add a method for querying tables
Update the 'CheckOrganization' pipeline stage so that the organization name must be in a new customers table before we'll allow events to proceed. The 'WithRegard' organization is created automatically.

We'll probably want more of this kind of functionality to ensure we aren't logging events that we shouldn't, so this isn't final but more of a way to test the effects on throughput that these kinds of tests might have.
Wait for the table to initialise before returning from the constructor
Change the organization name in the test to get through the organization check.
Add tests for the check organization stage