Copy & Paste

[fashxp]

• we need type specific clipboard (for documents, assets, data objects, etc…)
• copy and paste elements within tree

[lukmzig]

For asset we created a separate issue. For more info please look here: https://github.com/pimcore/studio-backend-bundle/issues/154#issuecomment-2180663991

For other elements we still need to create other logic first