Make recipes callable

[liamhuber]

When they have an underlying python reference function. I.e. always the case for atomic nodes, sometimes the case for workflow nodes, never the case for anything else.

Note that calling a workflow node is not the same as passing it to a WfMS. Calling it creates no internal structure, rather it simply invokes the underlying reference function (if one is there to invoke)

[github-actions]

👈 Launch a binder notebook on branch pyiron/flowrep/callable-recipe

[liamhuber]

Contributes towards but does not complete #181

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (5ccfffc) to head (1e7d166).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #197   +/-   ##
=======================================
  Coverage   99.24%   99.24%           
=======================================
  Files          33       33           
  Lines        2652     2666   +14     
=======================================
+ Hits         2632     2646   +14     
  Misses         20       20           

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