supportsinplacetransform for float-domain Chebyshev

[jishnub]

On master

julia> @btime Fun(x -> x^20, Chebyshev());
  107.806 μs (218 allocations: 19.08 KiB)

This PR

julia> @btime Fun(x -> x^20, Chebyshev());
  33.232 μs (118 allocations: 8.50 KiB)

The improvement comes from allocating fewer arrays, and carrying out transforms in-place.

[codecov]

Codecov Report

Base: 60.95% // Head: 67.15% // Increases project coverage by +6.20% 🎉

Coverage data is based on head (fd5d473) compared to base (a94565e).
Patch coverage: 83.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
+ Coverage   60.95%   67.15%   +6.20%     
==========================================
  Files          28       28              
  Lines        2492     2509      +17     
==========================================
+ Hits         1519     1685     +166     
+ Misses        973      824     -149     

Impacted Files	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	66.66% <ø> (ø)
...c/Spaces/Ultraspherical/UltrasphericalOperators.jl	75.40% <40.00%> (-0.98%)	⬇️
src/Spaces/Chebyshev/Chebyshev.jl	59.85% <100.00%> (+1.70%)	⬆️
src/Spaces/Chebyshev/ChebyshevOperators.jl	86.33% <100.00%> (+0.09%)	⬆️
src/Spaces/Hermite/Hermite.jl	70.88% <100.00%> (+22.16%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	80.14% <100.00%> (+12.34%)	⬆️
src/Spaces/PolynomialSpace.jl	89.31% <100.00%> (+0.59%)	⬆️
src/Spaces/Ultraspherical/ContinuousSpace.jl	54.28% <100.00%> (+3.03%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <0.00%> (+1.35%)	⬆️
... and 15 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.