refactored RedisMessageStore to use SimpleMessageGroup. Deleted RedisMessageGroup
polished RedisMessageStore, made it more inline with JdbcMessageStore, added additional tests
more polishing on RedisMessageStore, added more tests
removed test that was no longer valid. Downgraded spring-data-redis dependency to M4
changed UUID serializer to be StringRedisSerializer instead of custom class which essentially did the same thing
polished code based on the review comments. Rename onX methods to doX, removed this.hasKey in favor of this.redisTemplate.hasKey
polishing
removed afterPropertiesSet() calls in test
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