Solver for cubic equations.

[tky823]

Summary

Implement a solver for cubic equations, which will be used in IVA-IPA.

ref: #156

[codecov-commenter]

Codecov Report

Base: 94.39% // Head: 94.41% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (c2d237a) compared to base (10d3c9a).
Patch coverage: 97.29% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
+ Coverage   94.39%   94.41%   +0.01%     
==========================================
  Files          41       43       +2     
  Lines        5122     5158      +36     
==========================================
+ Hits         4835     4870      +35     
- Misses        287      288       +1     

Impacted Files	Coverage Δ
ssspy/linalg/polynomial.py	96.15% <96.15%> (ø)
ssspy/linalg/__init__.py	100.00% <100.00%> (ø)
ssspy/linalg/cubic.py	100.00% <100.00%> (ø)

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