Add aggregate notebook that explains how to aggregate dynamically sized outputs

[agoscinski]

Implements suggestions in issue #284

@superstar54 I have an issue with submit(wait=True) the output is None (see first example where I kept submit). EDIT: I see that this is something related to my local setup and not a general bug.

While I think the section about nested data types at the end is important, it does not really fit into the aggregate notebook. It is also more dealing with aiida-core issues than workgraph. I have no good idea at the moment. I would keep it there and see if we can move it somewhere more meaningful in the future.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.62%. Comparing base (5937b88) to head (9842670).
Report is 79 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
+ Coverage   75.75%   80.62%   +4.87%     
==========================================
  Files          70       66       -4     
  Lines        4615     5147     +532     
==========================================
+ Hits         3496     4150     +654     
+ Misses       1119      997     -122     

Flag	Coverage Δ
python-3.11	80.55% <ø> (+4.88%)	⬆️
python-3.12	80.55% <ø> (?)
python-3.9	80.58% <ø> (+4.84%)	⬆️

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[superstar54]

Hi @agoscinski , thanks for the work! I requested a few changes.

[superstar54]

Thanks for the update, almost ready to go. I added one last comment.

[agoscinski]

Because the graph builder example also uses the term dynamic input I switched to usage dynamic input port. Not sure if it should be dynamic input socket.

[superstar54]

LGTM!