Make a field in TVList final and static to save memory (#7463)

diff --git a/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java b/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java
index 721f9cd..8dcea92 100644
--- a/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java
+++ b/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java
@@ -49,7 +49,7 @@
 
   protected static final int SMALL_ARRAY_LENGTH = 32;
   protected static final String ERR_DATATYPE_NOT_CONSISTENT = "DataType not consistent";
-  long maxChunkRawSizeThreshold =
+  protected static final long maxChunkRawSizeThreshold =
       IoTDBDescriptor.getInstance().getConfig().getMaxChunkRawSizeThreshold();
   // list of timestamp array, add 1 when expanded -> data point timestamp array
   // index relation: arrayIndex -> elementIndex