Add inverse chebyshev transform plan for Dual

[LucasAschenbach]

I have added a method for the inverse Chebyshev transform plan on dual vectors to support transforming functionals with dual number coefficients to the value space.

This issue came up when trying to multiply two functionals with enough non-zero dual coefficients to convert to the value space.

[jishnub]

Thanks! Could you add a test?

[LucasAschenbach]

Sure!

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.30% 🎉

Comparison is base (0e78219) 28.06% compared to head (aed75c8) 28.36%.
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #904      +/-   ##
==========================================
+ Coverage   28.06%   28.36%   +0.30%     
==========================================
  Files          11       11              
  Lines         563      564       +1     
==========================================
+ Hits          158      160       +2     
+ Misses        405      404       -1     

Files Changed	Coverage Δ
ext/ApproxFunDualNumbersExt.jl	21.27% <100.00%> (+3.88%)	⬆️

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[LucasAschenbach]

I have added a test for the inverse Chebyshev transform on dual numbers. Should I keep the comment or remove it?

[jishnub]

I think the comment is helpful

[jishnub]

Could you also bump the patch version?

[LucasAschenbach]

Do you mean setting the package version to 0.13.23?

[jishnub]

Yes, exactly. I'll tag a release after merging

[LucasAschenbach]

Done 👍

[jishnub]

Thanks for the PR!