trying to fix randomness in SNCoordGivenPhysicalSep

[mi-dai]

There was a random separation generated in this function that was not using a random number generator. I tried to add an rng but don't think I know how to do this properly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.47%. Comparing base (7337e39) to head (cc1ed4d).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #788   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files          71       71           
  Lines        6737     6739    +2     
=======================================
+ Hits         6230     6232    +2     
  Misses        507      507           

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[github-actions]

Before [2eab3e8]	After [77e3c0e]	Ratio	Benchmark (Parameter)
1.97±0.3ms	1.44±0.5ms	~0.73	benchmarks.TimeSuite.time_evaluate_simple_linear_wavelength_model
1.40±0.05ms	1.57±0.03ms	1.12	benchmarks.TimeSuite.time_apply_passbands
13.2±0.1μs	13.5±0.1μs	1.02	benchmarks.TimeSuite.time_sample_x1_from_hostmass
5.60±0.09ms	5.66±0.03ms	1.01	benchmarks.TimeSuite.time_lightcurve_source
28.3±0.6μs	28.6±0.4μs	1.01	benchmarks.TimeSuite.time_make_simple_linear_wavelength_model
8.41±0.2ms	8.38±0.2ms	1.00	benchmarks.TimeSuite.time_apply_white_noise
6.44±0.1ms	6.43±0.1ms	1.00	benchmarks.TimeSuite.time_evaluate_salt3_passbands
10.2±0.07ms	10.2±0.1ms	1.00	benchmarks.TimeSuite.time_load_passbands
92.7±0.5μs	92.6±1μs	1.00	benchmarks.TimeSuite.time_sample_x0_from_distmod
98.8±1ms	97.8±1ms	0.99	benchmarks.TimeSuite.time_additive_multi_model_source

Click here to view all benchmarks.

[mi-dai]

Resolved in #789