[BUG] InMemoryLog preserve offset orders

rust/worker/src/execution/operators/pull_log.rs

@@ -117,7 +117,8 @@ impl Operator<PullLogsInput, PullLogsOutput> for PullLogsOperator {
             }
 
             num_records_read += logs.len();
-            offset += batch_size as i64;
+            // unwrap here is safe because we just checked if empty
+            offset = logs.last().unwrap().log_offset + 1;
             result.append(&mut logs);
 
             // We used a a timestamp and we didn't get a full batch, so we have retrieved