perf: spread initialisation load across cluster (#239)

Author: supercaracal

lib/redis_client/cluster/node.rb

@@ -201,6 +201,10 @@ def each(&block)
         @topology.clients.each_value(&block)
       end
 
+      def shuffled_nodes
+        @topology.clients.values.shuffle
+      end
+
       def sample
         @topology.clients.values.sample
       end

lib/redis_client/cluster/router.rb

@@ -23,7 +23,7 @@ def initialize(config, pool: nil, **kwargs)
         @pool = pool
         @client_kwargs = kwargs
         @node = fetch_cluster_info(@config, pool: @pool, **@client_kwargs)
-        @command = ::RedisClient::Cluster::Command.load(@node)
+        @command = ::RedisClient::Cluster::Command.load(@node.shuffled_nodes)
         @mutex = Mutex.new
         @command_builder = @config.command_builder
       end