BUG: use SetProjectionRef() instead of MetadataKey::ProjectionRefKey to set the output projection (new metadata framework)

This reverts commit ac35c7d8.

Merge branch '2024-metadata-refac' of https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb into 2024-metadata-refac

REFAC: return an empty projection in GetGCPProjection if the image has no gcp instead of asserting that the image has gcps (or segfault in release mode). This means that the user of ImageCommon does not have to check that the image has gcp before calling this method

When using ToJSON attribute to export metadata, the order the metadata
are exported depends on the platform. This is not a problem when
working with metadata, but the test (as they are currently made) need
a constant order of the metadata in the output file.

ENH: move implementation of non virtual methods to a source file to add them in the shared library in MetadataStorageInterface and MetadataSupplierInterface

BUG: remove cast to char* const& as it does not compile on windows, the lexical cast to char* is notneeded anyway

Fix spatial reference equality tests

Closes #2051 and #2055

See merge request orfeotoolbox/otb!720

Fix Centos CI build

See merge request orfeotoolbox/otb!719

ENH: override SetNumberOfComponentsPerPixel to implement a default behavior for band specific metadata copy

BUG: Use the same mapping strategy when comparing spatial reference from a Datasource and a wkt string

BUG: use the PCA transformation matrix instead of the ICA transformation matrix to determine the output size

BUG: #2046 Add an epsilon margin to compute the m_ReachableOutputRegion

Closes #2046

See merge request orfeotoolbox/otb!714

Error in the documenation of the QGIS plugin

See merge request orfeotoolbox/otb!716

Update GDAL version in superbuild (3.1.0)

Closes #2052

See merge request !715