Added delete policy request

Requests/DeletePolicy.cs

@@ -0,0 +1,27 @@
+using HermesSocketServer.Services;
+using ILogger = Serilog.ILogger;
+
+namespace HermesSocketServer.Requests
+{
+    public class DeletePolicy : IRequest
+    {
+        public string Name => "delete_policy";
+        public string[] RequiredKeys => ["id"];
+        private ChannelManager _channels;
+        private ILogger _logger;
+
+        public DeletePolicy(ChannelManager channels, ILogger logger)
+        {
+            _channels = channels;
+            _logger = logger;
+        }
+
+        public async Task<RequestResult> Grant(string sender, IDictionary<string, object>? data)
+        {
+            var channel = _channels.Get(sender);
+            channel.Policies.Remove(data!["id"].ToString());
+            _logger.Information($"Deleted a policy by id [policy id: {data["id"]}]");
+            return RequestResult.Successful(null);
+        }
+    }
+}