[NEW] Add two more values for slowlog command

[hwware]

Current slowlog get command return the following 6 values as below:
127.0.0.1:6381[10]> slowlog get

1. 1.(integer) 7
   2.(integer) 1678218844
   3.(integer) 5
   4. 1."client"
   2."getname"
   5. "127.0.0.1:58806"
   6. "MMM"

2. 1.(integer) 6
   2.(integer) 1678218835
   3.(integer) 5
   4. 1."client"
   2."setname"
   3."MMM"
   5. "127.0.0.1:58806"
   6. "MMM"

We need add 2 more values for it:
1. database index value which represents which database client executes the command
2. acl username (default username is "default")