For loop syntax

[JulianGCalderon]

• Changes ForStmt with new sintax elements
• Changes grammar.lalrpop to parse new syntax
• Adds tests and examples for three common use cases:
  • regular for
  • for as while
  • for as loop
• Adds syntax sugar to for as while and for as loop

[github-actions]

Benchmarking factorial

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.05%. Comparing base (53cddd9) to head (c3d0fd5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   57.35%   58.05%   +0.69%     
==========================================
  Files          34       34              
  Lines        3956     4022      +66     
==========================================
+ Hits         2269     2335      +66     
  Misses       1687     1687              

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