Add Fourier-Series Method

[conema]

Hello !

I was trying to use this package in one of my projects, but I found the existing methods to be too slow. In the literature[1], I found this other method, named "The Fourier-Series Method for Laplace Transforms", which seems to be pretty simple and fast (at least in my use case).
I don't usually play around with inverse Laplace transformations, so I cannot compare this method with the others, but I thought that it could be interesting to add it to the package.

Let me know what you think about it

[1] https://link.springer.com/chapter/10.1007/978-1-4757-4828-4_8

[codecov]

Codecov Report

Patch coverage: 84.00% and project coverage change: -5.81% ⚠️

Comparison is base (7811acf) 77.99% compared to head (56bf0a0) 72.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   77.99%   72.18%   -5.81%     
==========================================
  Files           6        7       +1     
  Lines         259      284      +25     
==========================================
+ Hits          202      205       +3     
- Misses         57       79      +22     

Files Changed	Coverage Δ
src/InverseLaplace.jl	30.00% <0.00%> (-5.30%)	⬇️
src/fourier_series.jl	95.45% <95.45%> (ø)

... and 4 files with indirect coverage changes

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[conema]

Just to be sure that somebody is pinged with the PR @jlapeyre

[jlapeyre]

Thanks! I didn't see this before, or forgot. I'll look at it.