Sl/refactor broadcasting and continue

[SophieL1]

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[codecov]

Codecov Report

❌ Patch coverage is 78.28947% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.99%. Comparing base (1a3c1f9) to head (9dc6332).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/reverse_mode.jl	72.11%	29 Missing ⚠️
src/sizes.jl	82.60%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
- Coverage   90.82%   89.99%   -0.84%     
==========================================
  Files          20       20              
  Lines        2377     2478     +101     
==========================================
+ Hits         2159     2230      +71     
- Misses        218      248      +30     

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