move types out of decoders package

internal/chunks/data_tracker_chunk.go

@@ -0,0 +1,16 @@
+package chunks
+
+type DataTrackerChunkData struct {
+	Pos       *DataTrackerXYZChunk
+	Speed     *DataTrackerXYZChunk
+	Ori       *DataTrackerXYZChunk
+	Status    *DataTrackerStatusChunk
+	Accel     *DataTrackerXYZChunk
+	TrgtPos   *DataTrackerXYZChunk
+	Timestamp *DataTrackerTimestampChunk
+}
+
+type DataTrackerChunk struct {
+	Data  DataTrackerChunkData
+	Chunk Chunk
+}