c/controller_api: add more information to backend_operation

Added revision, last error and retry count to backend operation. The
information will be used to track partition reconfiguration progress.

Signed-off-by: Michal Maslanka <michal@redpanda.com>

src/v/cluster/controller_api.cc

@@ -176,6 +176,9 @@ controller_api::get_reconciliation_state(model::ntp ntp) {
                 .source_shard = shard,
                 .p_as = std::move(m.delta.new_assignment),
                 .type = m.delta.type,
+                .current_retry = m.retries,
+                .last_operation_result = m.last_error,
+                .revision_of_operation = model::revision_id(m.delta.offset),
               };
           });
     }

src/v/cluster/types.h

@@ -2097,16 +2097,29 @@ struct delete_acls_reply
 
 struct backend_operation
   : serde::
-      envelope<backend_operation, serde::version<0>, serde::compat_version<0>> {
+      envelope<backend_operation, serde::version<1>, serde::compat_version<0>> {
     ss::shard_id source_shard;
     partition_assignment p_as;
     topic_table_delta::op_type type;
+
+    uint64_t current_retry;
+    cluster::errc last_operation_result;
+    model::revision_id revision_of_operation;
+
     friend std::ostream& operator<<(std::ostream&, const backend_operation&);
 
     friend bool operator==(const backend_operation&, const backend_operation&)
       = default;
 
-    auto serde_fields() { return std::tie(source_shard, p_as, type); }
+    auto serde_fields() {
+        return std::tie(
+          source_shard,
+          p_as,
+          type,
+          current_retry,
+          last_operation_result,
+          revision_of_operation);
+    }
 };
 
 struct create_data_policy_cmd_data