Give a little shortcut on constant data

[liamhuber]

Just adding

    @property
    def ConstantData.value(self):
        return self.output_ports[constant_recipe.ConstantRecipe.std_label].value

I'm not sure it's worth its very minimal weight yet, but there it is.

[github-actions]

👈 Launch a binder notebook on branch pyiron/flowrep/constant-shortcut

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.94%. Comparing base (4f65e6f) to head (9d36dd2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files          44       44           
  Lines        3569     3572    +3     
=======================================
+ Hits         3567     3570    +3     
  Misses          2        2           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.