Allow compute kwargs to be passed to GenericObjective and ObjectiveFromUser

[f0uriest]

Resolves #1224

[f0uriest]

@ddudt you made the linked issue, do you have a use case we can use as a test?

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_midres         |     -3.50 +/- 5.74     | -2.22e-02 +/- 3.64e-02 |  6.13e-01 +/- 3.0e-02  |  6.35e-01 +/- 2.1e-02  |
 test_build_transform_fft_highres        |     -1.39 +/- 3.04     | -1.36e-02 +/- 2.98e-02 |  9.65e-01 +/- 2.3e-02  |  9.78e-01 +/- 1.9e-02  |
 test_equilibrium_init_lowres            |     +1.05 +/- 2.93     | +4.05e-02 +/- 1.13e-01 |  3.89e+00 +/- 7.5e-02  |  3.85e+00 +/- 8.4e-02  |
 test_objective_compile_atf              |     -0.33 +/- 3.99     | -2.56e-02 +/- 3.15e-01 |  7.86e+00 +/- 2.4e-01  |  7.88e+00 +/- 2.1e-01  |
 test_objective_compute_atf              |     +5.76 +/- 4.26     | +6.06e-04 +/- 4.48e-04 |  1.11e-02 +/- 4.1e-04  |  1.05e-02 +/- 1.9e-04  |
 test_objective_jac_atf                  |     +2.71 +/- 4.03     | +5.02e-02 +/- 7.46e-02 |  1.90e+00 +/- 6.5e-02  |  1.85e+00 +/- 3.7e-02  |
 test_perturb_1                          |     +4.05 +/- 2.54     | +5.67e-01 +/- 3.56e-01 |  1.46e+01 +/- 2.3e-01  |  1.40e+01 +/- 2.7e-01  |
 test_proximal_jac_atf                   |     +0.52 +/- 0.97     | +4.19e-02 +/- 7.85e-02 |  8.17e+00 +/- 5.1e-02  |  8.13e+00 +/- 6.0e-02  |
 test_proximal_freeb_compute             |     +1.38 +/- 1.39     | +2.72e-03 +/- 2.73e-03 |  2.00e-01 +/- 1.9e-03  |  1.97e-01 +/- 1.9e-03  |
 test_build_transform_fft_lowres         |     -1.43 +/- 5.41     | -7.74e-03 +/- 2.92e-02 |  5.32e-01 +/- 2.3e-02  |  5.40e-01 +/- 1.8e-02  |
 test_equilibrium_init_medres            |     +0.37 +/- 2.78     | +1.55e-02 +/- 1.16e-01 |  4.19e+00 +/- 5.0e-02  |  4.18e+00 +/- 1.0e-01  |
 test_equilibrium_init_highres           |     +0.21 +/- 1.37     | +1.15e-02 +/- 7.48e-02 |  5.47e+00 +/- 6.5e-02  |  5.46e+00 +/- 3.7e-02  |
 test_objective_compile_dshape_current   |     -0.94 +/- 1.22     | -3.67e-02 +/- 4.76e-02 |  3.87e+00 +/- 2.7e-02  |  3.91e+00 +/- 3.9e-02  |
 test_objective_compute_dshape_current   |     +0.29 +/- 2.79     | +1.04e-05 +/- 1.02e-04 |  3.65e-03 +/- 3.3e-05  |  3.64e-03 +/- 9.6e-05  |
 test_objective_jac_dshape_current       |     +0.01 +/- 7.74     | +2.69e-06 +/- 3.20e-03 |  4.14e-02 +/- 1.9e-03  |  4.14e-02 +/- 2.5e-03  |
 test_perturb_2                          |     -3.53 +/- 2.93     | -6.94e-01 +/- 5.75e-01 |  1.90e+01 +/- 2.0e-01  |  1.96e+01 +/- 5.4e-01  |
 test_proximal_freeb_jac                 |     -1.57 +/- 1.51     | -1.19e-01 +/- 1.14e-01 |  7.46e+00 +/- 8.9e-02  |  7.58e+00 +/- 7.2e-02  |
 test_solve_fixed_iter                   |     -0.46 +/- 58.27    | -2.33e-02 +/- 2.96e+00 |  5.05e+00 +/- 2.1e+00  |  5.08e+00 +/- 2.1e+00  |

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.57%. Comparing base (2741269) to head (69574a7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1367   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          96       96           
  Lines       24405    24409    +4     
=======================================
+ Hits        23325    23329    +4     
  Misses       1080     1080           

Files with missing lines	Coverage Δ
desc/objectives/_generic.py	97.67% <100.00%> (+0.07%)	⬆️

... and 2 files with indirect coverage changes

[dpanici]

Power balance compute quantity - string kwarg may have issues