Add DataType#NUMBER

Added the enum-like value of NUMBER which
is used by the new DataPointNumber class
to identify its type.

src/main/java/com/hms_networks/americas/sc/extensions/datapoint/DataType.java

@@ -26,6 +26,9 @@ public class DataType {
   /** Byte assigned to represent the integer mapped string data type. */
   private static final byte DATA_TYPE_INTEGER_MAPPED_STRING = 5;
 
+  /** Byte assigned to represent the number data type. */
+  private static final byte DATA_TYPE_NUMBER = 6;
+
   /** Public instance of {@link DataType} representing boolean data type. */
   public static final DataType BOOLEAN = new DataType(DATA_TYPE_BOOLEAN);
 
@@ -45,6 +48,9 @@ public class DataType {
   public static final DataType INTEGER_MAPPED_STRING =
       new DataType(DATA_TYPE_INTEGER_MAPPED_STRING);
 
+  /** Public instance of {@link DataType} representing number data type. */
+  public static final DataType NUMBER = new DataType(DATA_TYPE_NUMBER);
+
   /** Instance data type. */
   private final byte instanceDataType;