Identity Fun in normalized Polynomial spaces

[jishnub]

This allows one to obtain

julia> f = Fun(NormalizedLegendre(0..1))
Fun(NormalizedLegendre(0..1), [0.5, 0.28867513459481287])

julia> f(0.4)
0.4

On master, this falls back to using Chebyshev as the space. Such a construction should work as long as the conversion between the canonical and the normalized space is defined.

[codecov]

Codecov Report

Merging #91 (6743751) into master (b08b5aa) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   57.91%   58.15%   +0.24%     
==========================================
  Files          27       27              
  Lines        2414     2421       +7     
==========================================
+ Hits         1398     1408      +10     
+ Misses       1016     1013       -3     

Impacted Files	Coverage Δ
src/Spaces/PolynomialSpace.jl	83.70% <100.00%> (+0.97%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	55.07% <0.00%> (+0.72%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	58.41% <0.00%> (+0.99%)	⬆️

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