Add the JWST aperture.

[ehpor]

This aperture is based on the one from WebbPSF. (FYI @mperrin)

This PR adds:

• Irregular polygons. I'm using Matplotlib Paths for evaluating those. This uses a bounding box, where only values inside the bounding box are evaluated. This provides an ~3x performance improvement. I didn't spend a lot of time on improving upon this even more.
• JWST aperture. This uses irregular polygons for the segments as they are slightly non-hexagonal. This is based on the pre-launch values as explained in the docstring/documentation.

This PR depends on #136, so test failures are expected until that PR is merged and this PR is rebased.

Reference apertures for test (with and without struts):

[codecov]

Codecov Report

Merging #139 (2677aec) into master (349d173) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
+ Coverage   80.45%   80.65%   +0.19%     
==========================================
  Files          94       94              
  Lines        6785     6854      +69     
==========================================
+ Hits         5459     5528      +69     
  Misses       1326     1326              

Impacted Files	Coverage Δ
hcipy/aperture/__init__.py	100.00% <ø> (ø)
hcipy/aperture/generic.py	93.15% <100.00%> (+0.50%)	⬆️
hcipy/aperture/realistic.py	96.56% <100.00%> (+0.20%)	⬆️
hcipy/fourier/fourier_transform.py	94.48% <0.00%> (+1.41%)	⬆️

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[syhaffert]

I have two comments for this PR.