Enable writing of data products from provider nodes

[knoepfel]

Closes #299

[greenc-FNAL]

Review the full CodeQL report for details.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
phlex/core/node_catalog.cpp	50.00%	0 Missing and 1 partial ⚠️

❌ Your project check has failed because the head coverage (75.77%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #301      +/-   ##
==========================================
+ Coverage   75.69%   75.77%   +0.07%     
==========================================
  Files         125      126       +1     
  Lines        2946     2951       +5     
  Branches      519      521       +2     
==========================================
+ Hits         2230     2236       +6     
  Misses        497      497              
+ Partials      219      218       -1     

Flag	Coverage Δ
unittests	75.77% <85.71%> (+0.07%)	⬆️

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Files with missing lines	Coverage Δ
phlex/core/declared_output.cpp	100.00% <100.00%> (ø)
phlex/core/declared_output.hpp	100.00% <100.00%> (ø)
phlex/core/edge_maker.hpp	100.00% <100.00%> (ø)
phlex/core/node_catalog.cpp	73.33% <50.00%> (+4.10%)	⬆️

... and 5 files with indirect coverage changes

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[marcpaterno]

Is it feasible to add a test that verifies that a product that was created by a provider is actually received by a writer? If the current testing does that, then I did not understand the test configuration well enough to discern it.

[knoepfel]

Is it feasible to add a test that verifies that a product that was created by a provider is actually received by a writer? If the current testing does that, then I did not understand the test configuration well enough to discern it.

Yes, this is possible. I will add a test.