Add roots and extend Jacobi recurrences

[dlfivefifty]

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[codecov]

Codecov Report

Base: 89.87% // Head: 89.93% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (afe6e6c) compared to base (547352c).
Patch coverage: 92.85% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   89.87%   89.93%   +0.06%     
==========================================
  Files          16       17       +1     
  Lines        1887     1958      +71     
==========================================
+ Hits         1696     1761      +65     
- Misses        191      197       +6     

Impacted Files	Coverage Δ
src/ClassicalOrthogonalPolynomials.jl	92.19% <88.88%> (-0.91%)	⬇️
src/roots.jl	89.65% <89.65%> (ø)
src/classical/jacobi.jl	85.82% <92.85%> (+0.92%)	⬆️
src/classical/fourier.jl	94.89% <94.11%> (-0.42%)	⬇️
src/classical/chebyshev.jl	89.36% <100.00%> (-0.08%)	⬇️
src/interlace.jl	86.22% <100.00%> (-0.25%)	⬇️
src/normalized.jl	83.33% <100.00%> (ø)

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