Add the ability to create models from synphot SourceSpectrum

[jeremykubica]

Add a helper function to create StaticSEDSource models from synphot SourceSpectrum models so users do not need to manually define the synphot model, generate the SED, etc.

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Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.37%. Comparing base (7cfb482) to head (e7056f2).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/tdastro/sources/static_sed_source.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #404      +/-   ##
==========================================
- Coverage   91.38%   91.37%   -0.02%     
==========================================
  Files          52       52              
  Lines        3728     3744      +16     
==========================================
+ Hits         3407     3421      +14     
- Misses        321      323       +2     

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[github-actions]

Before [7cfb482]	After [2c9b8c2]	Ratio	Benchmark (Parameter)
1.90±0.4ms	3.05±0.7ms	~1.60	benchmarks.TimeSuite.time_lightcurve_source
19.1±0.1ms	19.6±0.6ms	1.03	benchmarks.TimeSuite.time_make_and_evaluate_static_sed
45.3±0.2μs	46.5±1μs	1.03	benchmarks.TimeSuite.time_make_new_salt3_model
117±5μs	120±6μs	1.02	benchmarks.TimeSuite.time_evaluate_simple_linear_wavelength_source
672±9μs	684±10μs	1.02	benchmarks.TimeSuite.time_fnu_to_flam
33.1±0.2ms	33.6±0.09ms	1.01	benchmarks.TimeSuite.time_additive_multi_model_source
7.66±0.1ms	7.65±0.2ms	1.00	benchmarks.TimeSuite.time_apply_white_noise
8.40±0.04ms	8.44±0.06ms	1.00	benchmarks.TimeSuite.time_load_passbands
86.6±0.6μs	86.5±1μs	1.00	benchmarks.TimeSuite.time_make_and_evaluate_step_source
109±2μs	109±2μs	1.00	benchmarks.TimeSuite.time_sample_x0_from_distmod

Click here to view all benchmarks.

[mi-dai]

Looks good overall. One question: synphot.SourceSpectrum includes redshift. Should we keep it as z=0? (How can we ensure that?)

[jeremykubica]

Looks good overall. One question: synphot.SourceSpectrum includes redshift. Should we keep it as z=0? (How can we ensure that?)

I added a check to the code that z is not greater than zero. This means we can apply all redshift through one single code path. I added some notes to this to the notebook and a test for it as well.