Add an option "withscores" to ZRANK and ZREVRANK.
The syntax are:
```
zrank key member [WITHSCORE]
zrevrank key member [WITHSCORE]
```

With this option, will additionally return the member's score,
in the form of an array.
```
127.0.0.1:6666> zadd zset 1 a 2 b 3 c
(integer) 3
127.0.0.1:6666> zrank zset b withscore
1) (integer) 1
2) "2"
127.0.0.1:6666> zrevrank zset c withscore
1) (integer) 0
2) "3"
```

This option was added in Redis 7.2