Fixes#8070
When dragging a node, it is snapped to any axis being an extension to another node's boundary. This helps user keeping their nodes neatly aligned.
https://github.com/enso-org/enso/assets/3919101/36dd4d5f-55d3-4f3c-ba49-e8425fae8270
# Important Notes
* Now the position is saved to Yjs doc only when drag is finished.
* Node structure in graph store has two position fields: one representing what is currently stored in the node's metadata, and where the node is displayed. `nodeRects` use the visible rectangles.
