Reduce number of graph ports and edges

[knoepfel]

With #118 now merged, the number of ports for each node can be reduced:

• There no longer is a separate sender() and to_output() port for each node; they have both been collapsed into one called output_port()
  • This means that only one message is sent from a node instead of two.
• There no longer needs to be a separate flush message emitted for each iteration while unfolding a data product

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #361      +/-   ##
==========================================
- Coverage   83.38%   83.37%   -0.02%     
==========================================
  Files         129      129              
  Lines        3220     3212       -8     
  Branches      545      545              
==========================================
- Hits         2685     2678       -7     
  Misses        324      324              
+ Partials      211      210       -1     

Flag	Coverage Δ
unittests	83.37% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
phlex/core/declared_fold.hpp	95.16% <100.00%> (ø)
phlex/core/declared_provider.hpp	100.00% <100.00%> (ø)
phlex/core/declared_transform.hpp	88.23% <100.00%> (-1.24%)	⬇️
phlex/core/declared_unfold.hpp	96.42% <100.00%> (ø)
phlex/core/edge_creation_policy.hpp	80.00% <100.00%> (-1.82%)	⬇️
phlex/core/edge_maker.cpp	77.27% <100.00%> (ø)
phlex/core/edge_maker.hpp	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[wddgit]

I will take a look. I am busy finishing up something unrelated to DUNE, but probably will get to this later this afternoon.

[wddgit]

Looked good to me. I don't see any problems.