Update equations to match physics and boozer fit for general toroidal angle

[unalmis]

Resolves #1176.

• Update equations to use poloidal and toroidal angles rather than a particular choice of stream function. No changes were made in places where a particular choice of stream function is necessary to simplify the computation.
• Genearlizes boozer fit for arbitrary toroidal angle

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.33%. Comparing base (225d44e) to head (1c88963).
Report is 2025 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1177   +/-   ##
=======================================
  Coverage   95.33%   95.33%           
=======================================
  Files          90       90           
  Lines       22643    22699   +56     
=======================================
+ Hits        21586    21640   +54     
- Misses       1057     1059    +2     

Files with missing lines	Coverage Δ
desc/compute/_core.py	100.00% <100.00%> (ø)
desc/compute/_field.py	100.00% <100.00%> (ø)
desc/compute/_omnigenity.py	99.21% <100.00%> (ø)
desc/compute/_profiles.py	99.19% <ø> (ø)

... and 3 files with indirect coverage changes

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     -1.18 +/- 6.46     | -6.52e-03 +/- 3.56e-02 |  5.45e-01 +/- 3.2e-02  |  5.52e-01 +/- 1.5e-02  |
 test_build_transform_fft_midres         |     +2.36 +/- 3.53     | +1.47e-02 +/- 2.20e-02 |  6.38e-01 +/- 1.5e-02  |  6.23e-01 +/- 1.6e-02  |
 test_build_transform_fft_highres        |     -0.87 +/- 2.60     | -8.96e-03 +/- 2.67e-02 |  1.02e+00 +/- 2.5e-02  |  1.03e+00 +/- 1.0e-02  |
 test_equilibrium_init_lowres            |     +2.39 +/- 2.25     | +9.56e-02 +/- 9.01e-02 |  4.10e+00 +/- 7.3e-02  |  4.00e+00 +/- 5.2e-02  |
 test_equilibrium_init_medres            |     -2.43 +/- 3.95     | -1.11e-01 +/- 1.80e-01 |  4.44e+00 +/- 1.2e-01  |  4.55e+00 +/- 1.3e-01  |
 test_equilibrium_init_highres           |     +4.01 +/- 4.76     | +2.28e-01 +/- 2.70e-01 |  5.90e+00 +/- 2.5e-01  |  5.67e+00 +/- 9.1e-02  |
 test_objective_compile_dshape_current   |     -0.20 +/- 1.22     | -7.85e-03 +/- 4.79e-02 |  3.93e+00 +/- 4.2e-02  |  3.93e+00 +/- 2.2e-02  |
 test_objective_compile_atf              |     -0.33 +/- 2.15     | -2.70e-02 +/- 1.74e-01 |  8.06e+00 +/- 1.6e-01  |  8.09e+00 +/- 7.2e-02  |
 test_objective_compute_dshape_current   |     -1.76 +/- 7.64     | -6.35e-05 +/- 2.75e-04 |  3.54e-03 +/- 7.8e-05  |  3.60e-03 +/- 2.6e-04  |
 test_objective_compute_atf              |     +1.92 +/- 6.10     | +2.04e-04 +/- 6.46e-04 |  1.08e-02 +/- 4.5e-04  |  1.06e-02 +/- 4.7e-04  |
 test_objective_jac_dshape_current       |     -4.42 +/- 8.45     | -1.86e-03 +/- 3.56e-03 |  4.03e-02 +/- 2.8e-03  |  4.21e-02 +/- 2.2e-03  |
 test_objective_jac_atf                  |     -0.89 +/- 2.46     | -1.73e-02 +/- 4.78e-02 |  1.93e+00 +/- 4.0e-02  |  1.94e+00 +/- 2.6e-02  |
 test_perturb_1                          |     -0.13 +/- 1.41     | -1.73e-02 +/- 1.82e-01 |  1.29e+01 +/- 1.6e-01  |  1.29e+01 +/- 9.3e-02  |
 test_perturb_2                          |     -0.26 +/- 2.01     | -4.65e-02 +/- 3.65e-01 |  1.81e+01 +/- 2.1e-01  |  1.82e+01 +/- 3.0e-01  |
 test_proximal_jac_atf                   |     -0.35 +/- 1.20     | -2.91e-02 +/- 9.93e-02 |  8.22e+00 +/- 7.7e-02  |  8.25e+00 +/- 6.2e-02  |
 test_proximal_freeb_compute             |     +0.01 +/- 1.13     | +2.33e-05 +/- 2.07e-03 |  1.83e-01 +/- 1.2e-03  |  1.83e-01 +/- 1.7e-03  |
 test_proximal_freeb_jac                 |     +1.35 +/- 1.19     | +1.02e-01 +/- 8.91e-02 |  7.62e+00 +/- 4.4e-02  |  7.52e+00 +/- 7.7e-02  |
 test_solve_fixed_iter                   |     -0.22 +/- 62.88    | -1.12e-02 +/- 3.19e+00 |  5.07e+00 +/- 2.3e+00  |  5.08e+00 +/- 2.2e+00  |