<!-- .github/pull_request_template.md -->
## Description
<!-- Provide a clear description of the changes in this PR -->
- Improved list handling, removed `.index` logic from
`get_graph_from_model`, transitioned to fully datapoint-oriented
processing
- Streamlined datapoint iteration by introducing `_datapoints_generator`
with nested loops
- Generalized field processing to handle mixed lists: `[DataPoint,
(Edge, DataPoint), (Edge, [DataPoint])]`, allowing dynamic multiple
edges generation
- Small improvements and refactorings
- Added tests to `test_get_graph_from_model_flexible_edges()` covering
weighted edges and dynamic multiple edges
- Created `dynamic_multiple_edges_example.py` demonstrating dynamic
multiple edges
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.
