ENH: add a method to set band specific metadata in ImageCommon

Modules/Core/ImageBase/include/otbImageCommons.h

@@ -33,6 +33,8 @@ class OTBImageBase_EXPORT ImageCommons
 public:
 
   void SetImageMetadata(ImageMetadata imd);
+  
+  void SetBandImageMetadata(ImageMetadata::ImageMetadataBandsType imd);
 
   const ImageMetadata & GetImageMetadata() const;
 

Modules/Core/ImageBase/src/otbImageCommons.cxx

@@ -28,6 +28,11 @@ void ImageCommons::SetImageMetadata(ImageMetadata imd)
   m_Imd = std::move(imd);
 }
 
+void ImageCommons::SetBandImageMetadata(ImageMetadata::ImageMetadataBandsType bands)
+{
+  m_Imd.Bands = std::move(bands);
+}
+
 const ImageMetadata & ImageCommons::GetImageMetadata() const
 {
   return m_Imd;