We now allow the internally created Jackson ObjectMapper to be customized and further configured after construction of the GenericJackson2JsonRedisSerializer when a user does not explicitly provide a custom ObjectMapper during construction. Even when providing a custom ObjectMapper, not all configuration applied by the GenericJackson2JsonRedisSerialzier (such as (standard) type resolution) to the internal ObjectMapper would get applied to the user-provided ObjectMapper as well.
Closes#2601