Redis [NEW] add two option supprt for zadd

The problem/use-case that the feature addresses update zset member score if score meet some condition，just like the sql db update condition. now we must do this in lua script: local score = redis.call('zscore',keys[1],argv[1]) if argv[2]>score then redis.call('zscore', keys[1], argv[3]) end Now redis 'zadd' command has INCR and GT option. But we can not do this: redis.call('zadd', keys[1], GT,argv[2], 'INCR', argv[3], argv[1] ) 'INCR' would be reconginzed as zset member. Description of the feature

give zset more rich option.