Save Network: save the same as in NetworkX

##### Network version

1.9.0

##### Orange version

3.37.0

##### Expected behavior
Save Network saves the data (attributes) in the same way as etworkX would. See below.

##### Actual behavior
The data is saved as such. Orange can't read what it saves (attributes not loaded properly). NetworkX can't read what Orange saves. Also, Orange can't read what NetworkX saves.
![Uploading Screenshot 2024-07-15 at 10.39.39.png…]()

##### Steps to reproduce the behavior
import networkx as nx

# Create a graph
```
G = nx.Graph()

# Add nodes with attributes
G.add_node(1, name='Alice', age="30")
G.add_node(2, name='Bob', age="25")
G.add_node(3, name='Charlie', age="35")
G.add_node(4, name='David', age="40")

# Add edges
G.add_edge(1, 2)
G.add_edge(1, 3)
G.add_edge(2, 3)
G.add_edge(3, 4)

nx.write_pajek(G, "simple_network.net")
```

##### Additional info (worksheets, data, screenshots, ...)
While pajek doesn't have a documentation on its format (from what I know), it would be nice to have the format transferable between NetworkX and Orange. Or at the very least for Orange to properly read the data it saves.

Start at the Save Network widget and reproduce the issue with the provided NetworkX snippet. Compare the generated Pajek data with what Orange reads and what NetworkX writes; done means Orange and NetworkX can exchange node attributes and Orange can read its own saved data correctly.

Written by the indexing model from the issue text.