ISSUE-40 Support for China region

[JoeShi]

Description:

1. Add option to append line break to each record from Kafka. Add an option appendLineBreak, by enabling this option, the connector will append \n to each record before injecting into Kinesis Datastreams.
2. Add support for China region. Now if the connector is configured to be used in AWS China region, it will change to the correct Kinesis/Firehose endpoint.

Issue Reference URL

#40

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