conversion_type for normalized spaces and canonical

[jishnub]

The following works after this:

julia> (Derivative() + Fun(NormalizedChebyshev())) * Fun(NormalizedChebyshev())
Fun(Ultraspherical(1), [1.25, 0.0, 0.25])

[codecov]

Codecov Report

Merging #94 (9500126) into master (75d6dd8) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   58.78%   58.98%   +0.19%     
==========================================
  Files          28       28              
  Lines        2458     2460       +2     
==========================================
+ Hits         1445     1451       +6     
+ Misses       1013     1009       -4     

Impacted Files	Coverage Δ
src/Spaces/PolynomialSpace.jl	86.52% <100.00%> (+1.87%)	⬆️

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