Support trident transactional spout

[pjroth]

This spout at this time seems to be of non-transactional type (implements a non-trident spout interface IRichSpout). I would like to use kinesis to implement storm trident transactions which require a transactional spout.

The bottom of this page lists the transactional spouts that I believe would be needed to be used to do this:
https://storm.apache.org/documentation/Trident-spouts.html