• added Cluster support
• fix FindKeys enum (used ServerCommands::command)
• added BulkString::to_usize
• added Deref support for BulkString
• added IntoIterator support for CommandArgs
• added Deref support for CommandArgs
• added FromSingleValueArray support for SmallVec
• added all cluster related commands
• fix CallBuilder when there is no args/keys
• fix RESP3
• refactored Redis errors (extract error kind in a specific enum)