Extend normalizedspace for PolynomialSpace

[jishnub]

This provides a uniform way to construct normalized spaces over intervals/segments or piecewise domains:

julia> d = Segment(-1..0)∪Segment(0..1)
the segment [-1.0,0.0] ∪ the segment [0.0,1.0]

julia> S = PiecewiseSpace(Chebyshev.(components(d)))
Chebyshev(the segment [-1.0,0.0]) ⨄ Chebyshev(the segment [0.0,1.0])

julia> normalized(S)
NormalizedChebyshev(the segment [-1.0,0.0]) ⨄ NormalizedChebyshev(the segment [0.0,1.0])

julia> S = Chebyshev(0..1)
Chebyshev(0..1)

julia> normalized(S)
NormalizedChebyshev(0..1)

[codecov]

Codecov Report

Patch coverage: 86.25% and project coverage change: -0.62 ⚠️

Comparison is base (69c583a) 69.14% compared to head (638aaf7) 68.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
- Coverage   69.14%   68.52%   -0.62%     
==========================================
  Files          28       28              
  Lines        2573     2621      +48     
==========================================
+ Hits         1779     1796      +17     
- Misses        794      825      +31     

Impacted Files	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	81.48% <ø> (ø)
src/Spaces/Jacobi/jacobitransform.jl	100.00% <ø> (ø)
src/Spaces/Ultraspherical/DirichletSpace.jl	48.64% <37.93%> (-1.36%)	⬇️
src/Spaces/Chebyshev/Chebyshev.jl	59.15% <100.00%> (-0.71%)	⬇️
src/Spaces/Chebyshev/ChebyshevOperators.jl	97.14% <100.00%> (+10.28%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	65.71% <100.00%> (-0.64%)	⬇️
src/Spaces/Jacobi/JacobiOperators.jl	79.64% <100.00%> (-4.04%)	⬇️
src/Spaces/PolynomialSpace.jl	92.50% <100.00%> (+0.54%)	⬆️
src/Spaces/Spaces.jl	100.00% <100.00%> (ø)
src/Spaces/Ultraspherical/Ultraspherical.jl	93.10% <100.00%> (+2.03%)	⬆️
... and 1 more

... and 6 files with indirect coverage changes

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