[BUG] HGETF command is not replying with string

**Describe the bug**

If the value of the field is an integer, HGETF replies it as integer. But should always be string

**To reproduce**

```
127.0.0.1:6379> hset hash one 1
(integer) 1
127.0.0.1:6379> hget hash one
"1"
127.0.0.1:6379> hgetf hash fields 1 one
1) (integer) 1
```

**Expected behavior**

```
127.0.0.1:6379> hgetf hash fields 1 one
1) "1"
```
