feat(layer-image): add zIndex editing for layer image objects

Closes MIN-91

requested review from @KonradAt

approved this merge request

deleted the feat/MIN-91-editing-layer-data branch. This merge request now targets the development branch

added 29 commits

• 023cc449...d9f08711 - 28 commits from branch development
• 71ee564c - chore: merge conflict resolve

Compare with previous version

enabled an automatic merge when all merge checks for 71ee564c pass

canceled the automatic merge

enabled an automatic merge when all merge checks for 71ee564c pass

merged

mentioned in commit 26baf941