Improve controls in schema diagram

[Logende]

Copy and paste functionality for nodes or even attributes?

[Logende]

Tasks:

1. When using Copy Key Combination (often CTRL + C, other combination for some systems), copy the schema of the currently selected node or attribute into clipboard. Possibly store more metadata in clipboard, etc. whether it is an attribute or node or enumeration)
2. When using Paste Key Combination, depending on whether the clipboard contains an attribute or node or enumeration schema, insert the corresponding thing into the graph

[Logende]

Related Code

https://github.com/MetaConfigurator/meta-configurator/tree/main/meta_configurator/src/components/panels/schema-diagram

https://github.com/MetaConfigurator/meta-configurator/blob/main/meta_configurator/src/components/panels/schema-diagram/VueFlowPanel.vue

[Logende]

Possibly when doing copy combination: save whole sub-schema of currently selected element.
First verify by using paste inside the text editor to see if proper schema was copied.

Then whenever someone tries paste combination in Schema Diagram, check whether it is an object schema (then add whole object schema to $defs section in schema) or attribute schema (then add attribute to currently selected object) or enumeration schema (then add new enumeration), etc.