suspend fun RedisClient.sdiffstoreAwait(destkey: String, key: String, cmpkeys: List<String>): Long
Subtract multiple sets and store the resulting set in a key
destkey - Destination key where the result should be stored
key - Key identifying the set to compare with all other sets combined
cmpkeys - List of keys identifying sets to subtract from the key set
handler - Handler for the result of this call.
Return