hasconversion for tensorspace

[jishnub]

After this, the following works:

julia> ApproxFunBase.hasconversion(Chebyshev()*Legendre(), Chebyshev()*NormalizedLegendre())
true

On master

julia> f = Fun((x,y)->x^10*y^4 + x^2*y^3, Chebyshev()*Legendre());

TTFX

julia> @time Fun(f, Chebyshev()*NormalizedLegendre());
 12.396606 seconds (41.16 M allocations: 2.226 GiB, 6.72% gc time, 99.99% compilation time)

Benchmark

julia> @btime Fun($f, Chebyshev()*NormalizedLegendre());
  287.812 μs (416 allocations: 66.70 KiB)

This PR
TTFX

julia> @time Fun(f, Chebyshev()*NormalizedLegendre());
 10.915021 seconds (38.30 M allocations: 2.089 GiB, 6.96% gc time, 99.99% compilation time)

Benchmark

julia> @btime Fun($f, Chebyshev()*NormalizedLegendre());
  66.401 μs (1386 allocations: 113.58 KiB)

The allocations go up, but the execution time is lower.

[codecov]

Codecov Report

Base: 61.05% // Head: 67.38% // Increases project coverage by +6.33% 🎉

Coverage data is based on head (c60b2b2) compared to base (864d832).
Patch coverage: 83.67% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   61.05%   67.38%   +6.33%     
==========================================
  Files          28       28              
  Lines        2488     2493       +5     
==========================================
+ Hits         1519     1680     +161     
+ Misses        969      813     -156     

Impacted Files	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	66.66% <ø> (ø)
src/Spaces/Chebyshev/Chebyshev.jl	59.57% <ø> (+1.41%)	⬆️
src/Spaces/Hermite/Hermite.jl	70.51% <ø> (+21.79%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <ø> (+1.35%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	65.04% <66.66%> (+1.94%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	80.68% <81.48%> (+13.26%)	⬆️
src/Spaces/PolynomialSpace.jl	89.10% <91.66%> (+0.70%)	⬆️
src/Spaces/Ultraspherical/Ultraspherical.jl	79.31% <100.00%> (+1.72%)	⬆️
... and 15 more

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