Introducing AsSimplifiedExpression() Requirement to Expression Interface

[kwesiRutledge]

Summary

On the course to fixing a bug in MatProGo-dev/simplex, we realized that there was a problem with (p Polynomial) Substitute. The issue was shared with other polynomial objects.

We began to find that the issue could be helped by introducing a proper Simplification method to all expressions to avoid some issues of complicated conversions in the Polynomial methods.

Introduced the AsSimplifiedExpression() method to the Expression (and related) interfaces. This should make it much easier (thoughtless really) to simplify.

[codecov]

Codecov Report

❌ Patch coverage is 77.38095% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.46%. Comparing base (9adff8d) to head (82f7c6a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
symbolic/monomial_matrix.go	75.67%	7 Missing and 2 partials ⚠️
symbolic/matrix_expression.go	80.48%	7 Missing and 1 partial ⚠️
symbolic/polynomial_vector.go	56.25%	6 Missing and 1 partial ⚠️
symbolic/constant.go	0.00%	2 Missing ⚠️
symbolic/constant_matrix.go	66.66%	2 Missing ⚠️
symbolic/monomial_vector.go	84.61%	1 Missing and 1 partial ⚠️
symbolic/polynomial_matrix.go	85.71%	1 Missing and 1 partial ⚠️
symbolic/variable.go	0.00%	2 Missing ⚠️
symbolic/variable_matrix.go	50.00%	2 Missing ⚠️
symbolic/variable_vector.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   87.44%   87.46%   +0.02%     
==========================================
  Files          42       42              
  Lines        6332     6431      +99     
==========================================
+ Hits         5537     5625      +88     
  Misses        719      719              
- Partials       76       87      +11     

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