Include flattening algorithm

[samwaseda]

Now I included the algorithm to flatten nested workflows:

wf_dict = example_workflow.serialize_workflow()
wf_dict["inputs"] = {...} # The input parameters have to be set somehow
G = fwf.get_workflow_graph(wf_dict)
wf_dict_flat = fwf.graph_to_wf_dict(G, flatten=True)

This gives you a flat representation instead of a nested workflow (if example_workflow is nested). I included one very simple test in the unit tests for a proof of concept, but I think really interesting will be when control flows are added (which will be hopefully stacked PRs)

[github-actions]

👈 Launch a binder notebook on branch pyiron/flowrep/flattening

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.46%. Comparing base (1a11125) to head (b9e5645).

Files with missing lines	Patch %	Lines
flowrep/workflow.py	94.11%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
- Coverage   98.64%   98.46%   -0.18%     
==========================================
  Files          16       16              
  Lines        1250     1307      +57     
==========================================
+ Hits         1233     1287      +54     
- Misses         17       20       +3     

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