Conversions from Polynomials.ChebyshevT

[jishnub]

On master

julia> C = ChebyshevT([1,2,3])
ChebyshevT(1⋅T_0(x) + 2⋅T_1(x) + 3⋅T_2(x))

julia> @btime Fun($C, Chebyshev())
  14.825 μs (8 allocations: 544 bytes)
Fun(Chebyshev(), [1.0, 2.0, 3.0])

This PR

julia> @btime Fun($C, Chebyshev())
  53.640 ns (1 allocation: 80 bytes)
Fun(Chebyshev(), [1.0, 2.0, 3.0])

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (b13bf09) 72.54% compared to head (6116e5c) 72.56%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #305      +/-   ##
==========================================
+ Coverage   72.54%   72.56%   +0.01%     
==========================================
  Files          29       30       +1     
  Lines        2746     2748       +2     
==========================================
+ Hits         1992     1994       +2     
  Misses        754      754              

Files Changed	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	87.80% <ø> (ø)
...xt/ApproxFunOrthogonalPolynomialsPolynomialsExt.jl	100.00% <100.00%> (ø)

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