Retrieve objects from strings robustly

[liamhuber]

I wrote this for bagofholding, but wound up copy-pasting that also into pyiron_core. There I found an edge case I hadn't run into. In general, this concept of getting stuff back from a string "serialization" has come up a few times, and there are a few nasty edge cases to think about. I feel it would be helpful to do it once, right, here.

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_snippets/retrieve

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.12%. Comparing base (7fb974a) to head (46be80e).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   94.81%   95.12%   +0.30%     
==========================================
  Files          13       14       +1     
  Lines         540      574      +34     
==========================================
+ Hits          512      546      +34     
  Misses         28       28              

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[niklassiemer]

I did not check the tests, one very small nit which could be added. LGTM!