[fix][connectors redis]redis sink values保留字段类型方便反序列化 #589
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当写入sink的数据类型为string时,value为源数据的value值组成的数组根据分隔符去组成一个新的字符串,并且不能看到key和value的对应关系,拿到sink数据后,也不能根据反序列化获得对应的对象。修改后,存入的数据是根据key和value一一对应组成map并转成json格式的string,拿出sink数据后,能够根据反序列化获得对应的对象。