Sub-issue of #1506.

The metadata in OTB will be refactored in order to allow OSSIM removal.

The following macro-actions should be done:

• Define the basic struct to store metadata (ImageMetadata)
• Setup utility functions in GDALImageIO to efficiently retrieve metadata (dates, doubles, vectors,...)
• Implement metadata parsing into each sensor IMI
  • DIMAP ? for the PHR/S6/S7 family
  • DigitalGlobe ? for QB, WorldView, ...
  • Sentinel1
• Save ImageMetadata through GDALImageIO
• Load ImageMetadata from GDALImageIO2024-metadata-refac
• Translate OSSIM Keywordlist into ImageMetadata

Here is a detailed description of remaining work per-class:

• OSSIMAdapters
  • class ImageKeywordlist
    • ReadGeometry
    • WriteGeometry
• Metadata
  • class ImageMetadataBase
    • ToKeywordlist : handle Geometry keys
    • ToKeywordlist : handle LUT1D keys
    • ToKeywordlist : handle LUT2D keys
    • FromKeywordlist
  • class ImageMetadata
    • slice
    • append
    • compact
  • class OpticalImageMetadataInterface
    • ConvertImageKeywordlistToImageMetadata
  • class SARImageMetadataInterface
    • ConvertImageKeywordlistToImageMetadata
  • class DIMAPImageMetadataInterface ?
  • class DGImageMetadataInterface ?
• ImageBase
  • class ImageCommons
    • Move back GetGeotransform to otb::Image and otb::VectorImage
    • Move back the Get*Corners to otb::Image and otb::VectorImage, and return coordinates, in physical space, adapt usages of these function to add a GenericRSTranform to get WGS84 coords.
• IOGDAL
  • class GDALImageIO
    • ExportMetadata
    • ImportMetadata