STYLE: Use ITK_DEFAULT_COPY_AND_MOVE for RealTimeStamp and Region

Instead of "manually" defaulting their copy and move member functions.

Follow-up to two commits by Jon Haitz Legarreta Gorroño:

pull request InsightSoftwareConsortium#4626
commit 9aff210
"COMP: Use default copy, move for construc, assign `RealTimeStamp`"

pull request InsightSoftwareConsortium#4627
commit ec2677f
"COMP: Use `default` copy and move construct and assign in `itk::Region`"

Modules/Core/Common/include/itkRealTimeStamp.h

@@ -45,6 +45,8 @@ namespace itk
 class ITKCommon_EXPORT RealTimeStamp
 {
 public:
+  ITK_DEFAULT_COPY_AND_MOVE(RealTimeStamp);
+
   using Self = RealTimeStamp;
 
   friend class RealTimeClock;
@@ -55,13 +57,6 @@ class ITKCommon_EXPORT RealTimeStamp
   /** Destructor */
   ~RealTimeStamp();
 
-  RealTimeStamp(const RealTimeStamp &) = default;
-  RealTimeStamp &
-  operator=(const RealTimeStamp &) = default;
-  RealTimeStamp(RealTimeStamp &&) = default;
-  RealTimeStamp &
-  operator=(RealTimeStamp &&) = default;
-
   /** Native type used to represent the time in different time units. */
   using TimeRepresentationType = RealTimeInterval::TimeRepresentationType;
 

Modules/Core/Common/include/itkRegion.h

@@ -65,6 +65,8 @@ namespace itk
 class ITKCommon_EXPORT Region
 {
 public:
+  ITK_DEFAULT_COPY_AND_MOVE(Region);
+
   /** Standard class type aliases. */
   using Self = Region;
 
@@ -90,13 +92,6 @@ class ITKCommon_EXPORT Region
   Region() = default;
   virtual ~Region() = default;
 
-  Region(const Region &) = default;
-  Region &
-  operator=(const Region &) = default;
-  Region(Region &&) = default;
-  Region &
-  operator=(Region &&) = default;
-
 protected:
   /** Methods invoked by Print() to print information about the object
    * including superclasses. Typically not called by the user (use Print()