Introducing the LinearCoeff method as a requirement of the PolynomialLikeVector set of objects

[kwesiRutledge]

Several of the vectors that implement the PolynomialLikeVector interface contain a LinearCoeff method, but it was never required for those objects. I fixed the implementation of LinearCoeff for some of those objects and introduced a new "Base method" that does the computation for all of the PolynomialLikeVector objects.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.70%. Comparing base (c7ac66e) to head (253bd67).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
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  Coverage   85.70%   85.70%           
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  Files          38       38           
  Lines        5700     5700           
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  Hits         4885     4885           
  Misses        751      751           
  Partials       64       64           

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