Adds immutable stack implementation

[fr33m0nk]

• Adds immutable stack implementation

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 91.00%. Comparing base (d4196d4) to head (c3d09db).

Files	Patch %	Lines
src/data_structures/stack/core.clj	90.90%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   91.01%   91.00%   -0.02%     
==========================================
  Files          18       19       +1     
  Lines         267      300      +33     
  Branches       16       19       +3     
==========================================
+ Hits          243      273      +30     
  Misses          8        8              
- Partials       16       19       +3     

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