constant propagation in Space power

[jishnub]

After this, the following is type-stable:

julia> @inferred (x -> x^2)(Chebyshev(0..1))
Chebyshev(0..1) ⊗ Chebyshev(0..1)

[codecov]

Codecov Report

Base: 71.90% // Head: 71.95% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (38bdaae) compared to base (5da41bb).
Patch coverage: 83.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   71.90%   71.95%   +0.04%     
==========================================
  Files          79       79              
  Lines        8301     8305       +4     
==========================================
+ Hits         5969     5976       +7     
+ Misses       2332     2329       -3     

Impacted Files	Coverage Δ
src/Spaces/SumSpace.jl	71.31% <33.33%> (ø)
src/LinearAlgebra/helper.jl	64.23% <100.00%> (+0.08%)	⬆️
src/Multivariate/TensorSpace.jl	87.28% <100.00%> (+0.96%)	⬆️

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