pandaproxy/sr: add missing field option

(cherry picked from commit aad7627)

Author: IoannisRP

src/v/pandaproxy/schema_registry/protobuf.cc

@@ -276,6 +276,10 @@ auto field_options() {
         "packed", &pb::FieldOptions::has_packed, &pb::FieldOptions::packed},
       field_option{
         "lazy", &pb::FieldOptions::has_lazy, &pb::FieldOptions::lazy},
+      field_option{
+        "unverified_lazy",
+        &pb::FieldOptions::has_unverified_lazy,
+        &pb::FieldOptions::unverified_lazy},
       field_option{
         "weak", &pb::FieldOptions::has_weak, &pb::FieldOptions::weak},
       field_option{