added data cache in receiver #608
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In some situations, spark re-executes a stream multiple times (e.g. multiple actions or writers using the same reader stream). This results in having multiple receivers using the same consumer group-partition combo which is against the connector's best practice guideline. In order to avoid such situations, this PR adds a data cache in the cachedReceiver class which keeps the data received in the latest batch in order to re-use it if spark decides to re-execute the stream.