Add campaign manager

Hcs.WebApp/BackgroundServices/OperationExecutors/ExecutorBase.cs

@@ -0,0 +1,13 @@
+using Hcs.Broker;
+using Hcs.WebApp.Data.Hcs;
+
+namespace Hcs.WebApp.BackgroundServices.OperationExecutors
+{
+    public abstract class ExecutorBase(IClient client, Operation operation) : IExecutor
+    {
+        protected readonly IClient client = client;
+        protected readonly Operation operation = operation;
+
+        public abstract Task<string> ExecuteAsync(CancellationToken cancellationToken);
+    }
+}