Allow shared transforms between R, Z, lambda

[f0uriest]

Resolves #812

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     -0.14 +/- 2.50     | -1.74e-05 +/- 3.15e-04 |  1.26e-02 +/- 8.0e-05  |  1.26e-02 +/- 3.0e-04  |
 test_build_transform_fft_midres         |     +0.21 +/- 2.12     | +1.93e-04 +/- 1.92e-03 |  9.09e-02 +/- 1.3e-03  |  9.07e-02 +/- 1.4e-03  |
 test_build_transform_fft_highres        |     -1.37 +/- 0.82     | -6.26e-03 +/- 3.75e-03 |  4.52e-01 +/- 3.3e-03  |  4.58e-01 +/- 1.8e-03  |
+test_equilibrium_init_lowres            |    -31.42 +/- 1.45     | -1.90e-01 +/- 8.76e-03 |  4.14e-01 +/- 6.3e-03  |  6.03e-01 +/- 6.0e-03  |
+test_equilibrium_init_medres            |    -38.11 +/- 1.05     | -4.67e-01 +/- 1.29e-02 |  7.59e-01 +/- 1.0e-02  |  1.23e+00 +/- 8.1e-03  |
+test_equilibrium_init_highres           |    -44.07 +/- 0.87     | -1.83e+00 +/- 3.61e-02 |  2.32e+00 +/- 2.3e-02  |  4.14e+00 +/- 2.8e-02  |
 test_objective_compile_dshape_current   |     +0.36 +/- 0.75     | +1.66e-02 +/- 3.44e-02 |  4.63e+00 +/- 2.2e-02  |  4.61e+00 +/- 2.7e-02  |
 test_objective_compile_atf              |     -0.11 +/- 3.23     | -9.88e-03 +/- 2.98e-01 |  9.22e+00 +/- 1.3e-01  |  9.23e+00 +/- 2.7e-01  |
 test_objective_compute_dshape_current   |     +5.67 +/- 4.22     | +3.69e-04 +/- 2.74e-04 |  6.87e-03 +/- 1.2e-04  |  6.50e-03 +/- 2.5e-04  |
 test_objective_compute_atf              |     +3.84 +/- 1.88     | +5.09e-04 +/- 2.50e-04 |  1.38e-02 +/- 1.6e-04  |  1.33e-02 +/- 1.9e-04  |
 test_objective_jac_dshape_current       |     -2.28 +/- 7.49     | -1.09e-03 +/- 3.57e-03 |  4.65e-02 +/- 2.4e-03  |  4.76e-02 +/- 2.6e-03  |
 test_objective_jac_atf                  |     -3.18 +/- 4.23     | -6.52e-02 +/- 8.67e-02 |  1.98e+00 +/- 4.0e-02  |  2.05e+00 +/- 7.7e-02  |
+test_perturb_1                          |     -1.91 +/- 0.58     | -2.59e-01 +/- 7.86e-02 |  1.33e+01 +/- 6.0e-02  |  1.36e+01 +/- 5.1e-02  |
 test_perturb_2                          |     -1.06 +/- 0.68     | -2.05e-01 +/- 1.32e-01 |  1.92e+01 +/- 1.2e-01  |  1.94e+01 +/- 5.9e-02  |
 test_proximal_jac_atf                   |     +0.49 +/- 1.53     | +3.31e-02 +/- 1.03e-01 |  6.79e+00 +/- 7.8e-02  |  6.76e+00 +/- 6.8e-02  |
 test_proximal_freeb_compute             |     +2.50 +/- 1.46     | +3.01e-03 +/- 1.75e-03 |  1.24e-01 +/- 1.2e-03  |  1.21e-01 +/- 1.3e-03  |
 test_proximal_freeb_jac                 |     +0.85 +/- 4.57     | +6.87e-02 +/- 3.69e-01 |  8.14e+00 +/- 3.6e-01  |  8.07e+00 +/- 7.7e-02  |

[rahulgaur104]

Merge if all tests have passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.10%. Comparing base (9f7e8f5) to head (5ed92f7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #916      +/-   ##
==========================================
+ Coverage   95.05%   95.10%   +0.04%     
==========================================
  Files          83       83              
  Lines       20970    20980      +10     
==========================================
+ Hits        19934    19953      +19     
+ Misses       1036     1027       -9     

Files	Coverage Δ
desc/compute/utils.py	96.21% <100.00%> (+0.13%)	⬆️
desc/transform.py	93.27% <100.00%> (+2.39%)	⬆️