Add a draw method to produce graphviz images

[liamhuber]

For both prospective recipes and retrospective data.

E.g.,

Closes #318

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[github-actions]

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (47f0681) to head (6be8147).

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #324    +/-   ##
========================================
  Coverage   99.94%   99.95%            
========================================
  Files          44       52     +8     
  Lines        3590     4016   +426     
========================================
+ Hits         3588     4014   +426     
  Misses          2        2            

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[liamhuber]

@samwaseda, FYI this exists now! We can polish up the appearance going forward, but this is cleanly isolated and an optional dependency, so I'm going to carry straight on to the merge.

[liamhuber]

For posterity,

import flowrep as fr

@fr.workflow
def do_while(x0, limit, step):
    x = x0
    while fr.std.lt(x, limit):
        x = fr.std.add(x, step)
    return x

do_while.flowrep_recipe.draw()

Which is, IMO, solidly in "good enough"-territory