Adding test to ensure many membership tables can be created without errors

It doesn't replicate a multi-datacenter Cassandra cluster but it's about the best we can do in a unit test

Author: rkargMsft

test/Extensions/Tester.Cassandra/Clustering/CassandraClusteringTableTests.cs

@@ -282,6 +282,21 @@ public async Task MembershipTable_UpdateRow()
         }
     }
 
+    [Fact]
+    public async Task MembershipTable_ManyMembershipTables()
+    {
+        var tasks = new List<Task>();
+        for (var i = 0; i < 50; i++)
+        {
+            tasks.Add(Task.Run(async () =>
+            {
+                await Task.Yield();
+                var (membershipTable, _) = await CreateNewMembershipTableAsync();
+            }));
+        }
+        await Task.WhenAll(tasks);
+    }
+
     [Fact]
     public async Task MembershipTable_UpdateRowInParallel()
     {