feat: allow adding Node as child of Node

[AayushSabharwal]

Close #14

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.97%. Comparing base (69c1f25) to head (11bbe94).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   89.18%   90.97%   +1.78%     
==========================================
  Files           2        2              
  Lines         111      144      +33     
==========================================
+ Hits           99      131      +32     
- Misses         12       13       +1     

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[timholy]

This is nice, thanks!

[timholy]

JuliaRegistries/General#135219