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Cadence Worker service to host replicator (#563)

* Cadence Worker service to host replicator

New cadence-worker service and bootstrap code to bring up the new
service.  This service currently only host the replicator which consumes
replication tasks from kafka topic and applies to current Cadence
cluster.

MessagingClient interface abstract out interaction with Kafka.
KafkaClient provides implementation for the interface using kafka-client
library which consumes messages from Kafka broker.

Created separate Kafka configuration used for bootstrapping the
KafkaClient created during service startup and passed down to
replicator.

Created replicator.thrift which defines the payload which is sent over
to other clusters through KafkaClient.

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