Improved Deduplication Method

[BradyAJohnston]

Improved the de-duplication method. It is now more correct and also faster.

Fixes #4

Code mostly from @Quackarooni

Some relevant synthetic benchmarks below for speed improvements.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.85%. Comparing base (313665d) to head (7435077).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
databpy/nodes/appending.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   89.76%   89.85%   +0.08%     
==========================================
  Files          13       13              
  Lines         782      779       -3     
==========================================
- Hits          702      700       -2     
+ Misses         80       79       -1     

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