Add inv for 1st kind Chebyshev transforms

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Base: 79.52% // Head: 78.89% // Decreases project coverage by -0.63% ⚠️

Coverage data is based on head (477e6f7) compared to base (32a6a0b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
- Coverage   79.52%   78.89%   -0.64%     
==========================================
  Files          12       12              
  Lines        2037     2165     +128     
==========================================
+ Hits         1620     1708      +88     
- Misses        417      457      +40     

Impacted Files	Coverage Δ
src/chebyshevtransform.jl	97.10% <100.00%> (+0.15%)	⬆️
src/inufft.jl	97.10% <0.00%> (-2.90%)	⬇️
src/specialfunctions.jl	50.84% <0.00%> (-1.73%)	⬇️
src/nufft.jl	95.30% <0.00%> (-0.11%)	⬇️
src/hermite.jl	100.00% <0.00%> (ø)
src/libfasttransforms.jl	77.61% <0.00%> (+0.03%)	⬆️
src/clenshaw.jl	98.93% <0.00%> (+0.08%)	⬆️
src/PaduaTransform.jl	92.70% <0.00%> (+0.70%)	⬆️
src/gaunt.jl	86.74% <0.00%> (+1.74%)	⬆️

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