Add W7-X coils

[landreman]

Adds the W7-X coils in the same format used for NCSX and HSX.

[codecov]

Codecov Report

Base: 91.59% // Head: 91.61% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (576b3d4) compared to base (8db9451).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
+ Coverage   91.59%   91.61%   +0.01%     
==========================================
  Files          61       61              
  Lines        9689     9704      +15     
==========================================
+ Hits         8875     8890      +15     
  Misses        814      814              

Flag	Coverage Δ
unittests	91.61% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/simsopt/objectives/utilities.py	92.85% <ø> (ø)
src/simsopt/configs/zoo.py	100.00% <100.00%> (ø)

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