RelatedTweetConsumer - filter and duplicate strategies; TODO: related tweets abstraction
related tweet consumer - refactored related tweet store with map implementation, TODO: redis implementation
saving and counting related tweets. Split up FilterStrategies into FilterStrategies (filtering tweets) and DuplicateStrategies (returning original tweet, which the checked tweet is a duplicate of)
moved tests for filtering and duplicate strategies from TweetConsumerTest. Replaced TweetConsumer with RelatedTweetConsumer
saving only unique related tweets