Make a differentiable version of FourierRZToroidalSurface.constant_offset_surface

[dpanici]

Potentially useful if one desires an objective that concerns a conformal vessel to a changing eq during optimization.

[dpanici]

only is differentiable though if params is passed, otherwise the end will not be differentiatedcorrectlt

[github-actions]

Memory benchmark result

|               Test Name                |      %Δ      |    Master (MB)     |      PR (MB)       |    Δ (MB)    |    Time PR (s)     |  Time Master (s)   |
| -------------------------------------- | ------------ | ------------------ | ------------------ | ------------ | ------------------ | ------------------ |
  test_objective_jac_w7x                 |    5.55 %    |     3.831e+03      |     4.044e+03      |    212.55    |       38.55        |       36.15        |
  test_proximal_jac_w7x_with_eq_update   |    1.87 %    |     6.486e+03      |     6.608e+03      |    121.59    |       159.86       |       159.77       |
  test_proximal_freeb_jac                |   -0.26 %    |     1.321e+04      |     1.318e+04      |    -33.90    |       83.13        |       81.62        |
  test_proximal_freeb_jac_blocked        |    1.07 %    |     7.456e+03      |     7.536e+03      |    80.13     |       72.29        |       72.20        |
  test_proximal_freeb_jac_batched        |   -0.82 %    |     7.489e+03      |     7.428e+03      |    -61.05    |       72.29        |       72.70        |
  test_proximal_jac_ripple               |   -2.18 %    |     3.540e+03      |     3.463e+03      |    -77.25    |       64.68        |       64.59        |
  test_proximal_jac_ripple_bounce1d      |    0.17 %    |     3.510e+03      |     3.515e+03      |     5.80     |       75.34        |       75.43        |
  test_eq_solve                          |    1.53 %    |     1.975e+03      |     2.006e+03      |    30.28     |       93.17        |       93.26        |

For the memory plots, go to the summary of Memory Benchmarks workflow and download the artifact.

[dpanici]

todo: update this (does not return surface, only the points that would then be fit)

[dpanici]

dont know if this build_pinv does anything

[codecov]

Codecov Report

❌ Patch coverage is 14.77273% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.52%. Comparing base (a846c9b) to head (36e4beb).

Files with missing lines	Patch %	Lines
desc/objectives/_geometry.py	16.94%	49 Missing ⚠️
desc/geometry/surface.py	10.34%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2016      +/-   ##
==========================================
- Coverage   95.77%   95.52%   -0.26%     
==========================================
  Files         101      101              
  Lines       27796    27881      +85     
==========================================
+ Hits        26622    26632      +10     
- Misses       1174     1249      +75     

Files with missing lines	Coverage Δ
desc/geometry/surface.py	91.70% <10.34%> (-5.84%)	⬇️
desc/objectives/_geometry.py	86.60% <16.94%> (-10.19%)	⬇️

... and 2 files with indirect coverage changes

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