Add support for get_watermark_offsets #648
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This PR adds a new consumer function -
get_watermark_offsets- which leverages the get_watermark_offsets librdkafka binding to return the last known watermark values for a topic/partition. This is essentially a much more efficient version of query_watermark_offsets, which requires a network call to the broker, with some caveats (described in the docs for theget_watermark_offsetsmethod).