adding has node functionality and simplifying has edge

[JoOkuma]

Closes #231

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.45%. Comparing base (b35a0f1) to head (7d3e59f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
+ Coverage   88.39%   88.45%   +0.06%     
==========================================
  Files          55       55              
  Lines        3947     3942       -5     
  Branches      690      690              
==========================================
- Hits         3489     3487       -2     
+ Misses        276      273       -3     
  Partials      182      182              

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[TeunHuijben]

Hi @JoOkuma, thanks for this feature! Would this be ready to merge?

[JoOkuma]

@TeunHuijben , yes, thanks for the reminder.
Merged!