Derivative in normalized polynomial spaces

[jishnub]

This makes the following type-stable:

julia> @inferred Derivative(NormalizedLegendre(), 2)
DerivativeWrapper : NormalizedLegendre() → Jacobi(2,2)
 ⋅  ⋅  4.74342   ⋅         ⋅        ⋅        ⋅        ⋅       ⋅        ⋅      ⋅
 ⋅  ⋅   ⋅       9.35414    ⋅        ⋅        ⋅        ⋅       ⋅        ⋅      ⋅
 ⋅  ⋅   ⋅        ⋅       15.9099    ⋅        ⋅        ⋅       ⋅        ⋅      ⋅
 ⋅  ⋅   ⋅        ⋅         ⋅      24.6247    ⋅        ⋅       ⋅        ⋅      ⋅
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅      35.6931    ⋅       ⋅        ⋅      ⋅
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅        ⋅      49.295    ⋅        ⋅      ⋅
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅        ⋅        ⋅     65.5982    ⋅      ⋅
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅        ⋅        ⋅       ⋅      84.7607  ⋅
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅        ⋅        ⋅       ⋅        ⋅      ⋱
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅        ⋅        ⋅       ⋅        ⋅      ⋱
 ⋅  ⋅   ⋅        ⋅         ⋅        ⋅        ⋅        ⋅       ⋅        ⋅      ⋱

[codecov]

Codecov Report

Base: 61.78% // Head: 62.70% // Increases project coverage by +0.91% 🎉

Coverage data is based on head (7e7eb3a) compared to base (591136c).
Patch coverage: 98.96% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
+ Coverage   61.78%   62.70%   +0.91%     
==========================================
  Files          28       28              
  Lines        2546     2606      +60     
==========================================
+ Hits         1573     1634      +61     
+ Misses        973      972       -1     

Impacted Files	Coverage Δ
src/Spaces/PolynomialSpace.jl	91.90% <98.96%> (+2.24%)	⬆️

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