Improve inference in normalized space derivative

[jishnub]

After this, the following is type-inferred:

julia> D = @inferred (S -> Derivative(S, 2))(NormalizedLegendre(0..1))
DerivativeWrapper : NormalizedLegendre(0 .. 1) → Jacobi(2,2,0 .. 1)
  ⋅    ⋅   26.8328    ⋅       ⋅      ⋅        ⋅        ⋅        ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅      52.915    ⋅      ⋅        ⋅        ⋅        ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅     90.0     ⋅        ⋅        ⋅        ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅   139.298     ⋅        ⋅        ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅     201.911     ⋅        ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅        ⋅     278.855     ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅        ⋅        ⋅     371.08     ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅        ⋅        ⋅        ⋅    479.479  ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅        ⋅        ⋅        ⋅       ⋅     ⋱
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅        ⋅        ⋅        ⋅       ⋅     ⋅
  ⋅    ⋅     ⋅        ⋅       ⋅      ⋅        ⋅        ⋅        ⋅       ⋅     ⋅

[codecov]

Codecov Report

Patch coverage: 63.76% and project coverage change: -44.47% ⚠️

Comparison is base (4f33475) 71.88% compared to head (19e2821) 27.41%.
Report is 15 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #526       +/-   ##
===========================================
- Coverage   71.88%   27.41%   -44.47%     
===========================================
  Files          81       80        -1     
  Lines        8546     8363      -183     
===========================================
- Hits         6143     2293     -3850     
- Misses       2403     6070     +3667     

Files Changed	Coverage Δ
src/ApproxFunBase.jl	44.00% <ø> (-40.00%)	⬇️
src/Operators/SubOperator.jl	42.64% <0.00%> (-41.18%)	⬇️
src/Operators/banded/CalculusOperator.jl	17.21% <0.00%> (-58.60%)	⬇️
src/Operators/banded/Conversion.jl	22.95% <0.00%> (-63.49%)	⬇️
src/Spaces/ProductSpaceOperators.jl	0.00% <0.00%> (-65.37%)	⬇️
src/eigen.jl	0.00% <0.00%> (-96.43%)	⬇️
src/Fun.jl	36.17% <50.00%> (-31.62%)	⬇️
src/Operators/general/InterlaceOperator.jl	23.46% <66.66%> (-57.87%)	⬇️
src/LinearAlgebra/helper.jl	55.58% <100.00%> (-13.35%)	⬇️
src/Multivariate/TensorSpace.jl	39.83% <100.00%> (-45.34%)	⬇️
... and 3 more

... and 59 files with indirect coverage changes

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