neumann bcs now use vectors inste of namedtuples.

[cmhamel]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 79.01235% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.10%. Comparing base (7827c1f) to head (ff3ff64).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bcs/RobinBCs.jl	33.33%	10 Missing ⚠️
src/bcs/DirichletBCs.jl	40.00%	3 Missing ⚠️
src/Fields.jl	87.50%	2 Missing ⚠️
src/bcs/NeumannBCs.jl	94.28%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
- Coverage   68.11%   68.10%   -0.02%     
==========================================
  Files          54       54              
  Lines        4520     4552      +32     
==========================================
+ Hits         3079     3100      +21     
- Misses       1441     1452      +11     

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