The SQS seeder and the Poller seeder are removed, they weren't
adapted to the linear synchronization process and they are not
required anymore.
Also, all related classes and dependencies that where used by
these tasks were removed too.
The trait is implemented by TransactionPostgresDataHandler and
TransactionPostgresDataHandler.
This is a piece for creating endpoints interacting with transactions
from the database instead of the xsn service.
Alexis Hernandez