feat: Add ClearCart command and response, implement CancelOrder command with validation, and enhance DeliveryStatus and User models

src/CMSMicroservice.Protobuf/Protos/usercarts.proto

@@ -43,6 +43,12 @@ service UserCartsContract
             
         };
     };
+    rpc ClearCart(ClearCartRequest) returns (ClearCartResponse){
+        option (google.api.http) = {
+            post: "/ClearCart"
+            body: "*"
+        };
+    };
 }
 message CreateNewUserCartsRequest
 {
@@ -105,3 +111,16 @@ message GetAllUserCartsByFilterResponseModel
     string product_thumbnail_path = 9;
     google.protobuf.Timestamp created = 10;
 }
+
+// ClearCart Messages
+message ClearCartRequest
+{
+    int64 user_id = 1;
+}
+
+message ClearCartResponse
+{
+    int64 user_id = 1;
+    int32 removed_items_count = 2;
+    string message = 3;
+}