feat: add support for XYZ file format
Extend the application to support reading and writing XYZ image files. Update file dialogs to include XYZ format alongside TIFF. Implement XYZ format encoding and decoding in a new module, ensuring compatibility with existing image processing workflows.
Changelog: added Signed-off-by: BULGHERONI Antonio antonio.bulgheroni@ec.europa.eu
Closes #15 (closed)