Add 2 new routing mechanisms for records that use Kafka topic name for
routing and update configuration for how to route records.

The changes move the routing logic to a separate class with different
implementations that can be selected via the configuration. It preserves
backwards compatibility of current behavior, while adding 2 new ways to
route records to tables based on the Kafka topic and also allows
custom implementations of how records are routed.

The two new routing mechanisms allow the connector to consume from
multiple topics, eliminating the need to create separate connectors
for each topic to consume from.