Added the Substitute() and SubstituteAccordingTo() methods for constr…

[kwesiRutledge]

…aints to simplify some operations

[codecov]

Codecov Report

Attention: Patch coverage is 91.20879% with 8 lines in your changes missing coverage. Please review.

Project coverage is 87.48%. Comparing base (fbfc97e) to head (85db6dc).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
symbolic/vector_constraint.go	76.92%	6 Missing ⚠️
symbolic/scalar_constraint.go	94.73%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   86.75%   87.48%   +0.72%     
==========================================
  Files          42       42              
  Lines        5921     6009      +88     
==========================================
+ Hits         5137     5257     +120     
+ Misses        714      679      -35     
- Partials       70       73       +3     

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