Fixed default replication lag

Author: sakno

src/cluster/DotNext.Net.Cluster/Net/Cluster/Consensus/Raft/LeaderState.cs

@@ -25,6 +25,8 @@ internal sealed partial class LeaderState<TMember> : ConsensusState<TMember>
     internal LeaderState(IRaftStateMachine<TMember> stateMachine, int replicationLag)
         : base(stateMachine)
     {
+        Debug.Assert(replicationLag > 0);
+        
         timerCancellation = new();
         Token = timerCancellation.Token;
         runningReplications = new(9, ReferenceEqualityComparer.Instance);

src/cluster/DotNext.Net.Cluster/Net/Cluster/Consensus/Raft/RaftCluster.Configuration.cs

@@ -164,7 +164,7 @@ public int MaxReplicationLag
         {
             get;
             init => field = value > 0 ? value : throw new ArgumentOutOfRangeException(nameof(value));
-        }
+        } = 16;
 
         /// <inheritdoc cref="IClusterMemberConfiguration.IsLeaderLeaseEnabled"/>
         public bool IsLeaderLeaseEnabled { get; init; }

src/cluster/DotNext.Net.Cluster/Net/Cluster/Consensus/Raft/ReplicationUtils/ReplicationProcess.cs

@@ -38,6 +38,8 @@ internal sealed class ReplicationProcess<TMember> : ReplicationProcess, ILogEntr
 
     public ReplicationProcess(TMember member, int queueSize)
     {
+        Debug.Assert(queueSize > 0);
+        
         this.member = member;
 
         var channel = Channel.CreateBounded<ReplicationBarrier>(new BoundedChannelOptions(queueSize)