Merge pull request 'feat: added Ping/Pong rpc' (#2) from ping-pong-#1 into main

Reviewed-on: #2
Reviewed-by: Lennard Brinkhaus <lennard.brinkhaus@noreply.localhost>

plug.proto

@@ -1,4 +1,5 @@
 syntax = "proto3";
+import "google/protobuf/timestamp.proto";
 
 option go_package = "git.dragse.it/anthrove/plug-[REPLACE_ME]/api/gRPC";
 
@@ -6,6 +7,17 @@ service PlugConnector {
   rpc TaskStart(PlugTaskCreation) returns (PlugTaskStatus);
   rpc TaskStatus(PlugTask) returns (PlugTaskStatus);
   rpc TaskCancel(PlugTask) returns (PlugTaskStatus);
+  rpc Ping(PingRequest) returns (PongResponse);  // Added Ping endpoint
+}
+
+message PingRequest {
+  string message = 1; // Optional message field, can be removed if not needed
+  google.protobuf.Timestamp timestamp = 2;
+}
+
+message PongResponse {
+  string message = 1; // Optional message field, can be removed if not needed
+  google.protobuf.Timestamp timestamp = 2;
 }
 
 message PlugTaskStatus {