align structure more with underlying chunk layout

src/models/info/info-tracker-chunk.ts

@@ -1,6 +1,11 @@
 import { Chunk } from '../chunk';
 import { InfoTrackerNameChunk } from './info-tracker-name-chunk';
 
-export interface InfoTrackerChunk extends Chunk {
-  tracker_name?: InfoTrackerNameChunk;
+export interface InfoTrackerChunkData {
+  trackerName: InfoTrackerNameChunk;
+}
+
+export interface InfoTrackerChunk {
+  chunk: Chunk;
+  data?: InfoTrackerChunkData;
 }