## Sets Commands
see more: https://redis.io/commands#set
- [x] SADD key member [member ...]
- [x] SCARD key
- [x] SDIFF key [key ...]
- [x] SDIFFSTORE destination key [key ...]
- [x] SINTER key [key ...]
- [x] SINTERSTORE destination key [key ...]
- [x] SISMEMBER key member
- [x] SMEMBERS key
- [x] SMISMEMBER key member [member ...]
- [x] SMOVE source destination member
- [x] SPOP key [count]
- [x] SRANDMEMBER key [count]
- [x] SREM key member [member ...]
- [ ] SSCAN key cursor [MATCH pattern] [COUNT count]
- [x] SUNION key [key ...]
- [x] SUNIONSTORE destination key [key ...]