add crude encoding of PSN chunks

internal/encoders/data_tracker_chunk.go

@@ -0,0 +1,11 @@
+package encoders
+
+func EncodeDataTrackerChunk(trackerId uint16, fieldChunks [][]byte) []byte {
+	fieldChunkBytes := []byte{}
+
+	for _, fieldChunk := range fieldChunks {
+		fieldChunkBytes = append(fieldChunkBytes, fieldChunk...)
+	}
+
+	return EncodeChunk(trackerId, fieldChunkBytes, len(fieldChunks) > 0)
+}