Feature/sckan 300

[afonsobspinto]

Closes https://metacell.atlassian.net/browse/SCKAN-300

• Adds GraphRenderingState model (one to one with ConnectivityStatement) to store the serialized_graph json.
• Adds save icon to the graph diagram.
• Updates custom node to serialize and deserialize custom data.
• On click of save icon makes a patch request with the serialized_graph json data.
• Refactors out of graph component the algorithm to position the nodes and updates it to use the positions of the serialized_graph when possible:

2024-10-08.17-36-01.mp4

[ddelpiano]

@afonsobspinto question, are the update_at and saved_by used to update the change in the notes? Thanks

[afonsobspinto]

No. At the moment they are not used but I added them anyway because I can see it being useful for something like that.

[afonsobspinto]

We can also have a note in the graph container saying. "Last saved by: {saved_by}" and on hover shows the {updated_at}