feat: Enhance node serialization and deserialization for improved compatibility

[Ni-zav]

some minor improvements and feature to serialize Compositor Nodes:

• Implemented absolute location calculation for nodes to support Blender 4.2.
• Added checks for the existence of RNA types to gracefully handle unsupported socket types.
• Improved handling of Group Input/Output nodes to only serialize used sockets, reducing clutter in exported snippets.
• Introduced functionality to compact multiple Group Input nodes into a single node for cleaner exports.
• Enhanced error handling during node creation and socket setup to prevent crashes on unsupported types.
• Updated the refresh function to include Compositor nodes, ensuring all node types are accounted for.
• Added serialization for compositor File Output node slots to maintain output organization.
• Refined the import process to manage auto-created nodes and prevent duplicates when importing payloads.