Add a function to compute horizontal contributions to z deform.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.45763% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.96%. Comparing base (6ea74bc) to head (2bc013b).
⚠️ Report is 303 commits behind head on master.

Files with missing lines	Patch %	Lines
src/extras/okada.jl	97.22%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1707      +/-   ##
==========================================
+ Coverage   85.82%   85.96%   +0.13%     
==========================================
  Files         166      166              
  Lines       23260    23288      +28     
==========================================
+ Hits        19964    20020      +56     
+ Misses       3296     3268      -28     

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