Make the extinction libraries optional

[jeremykubica]

Moves two more dependencies to be optional:

• dust_extinction is used for to find and load models for the extinction effect.
• extinction is a dependency of sncosmo.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.99%. Comparing base (7f0ff01) to head (7f5fb92).
⚠️ Report is 220 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lightcurvelynx/effects/extinction.py	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #552      +/-   ##
==========================================
- Coverage   91.89%   90.99%   -0.91%     
==========================================
  Files          55       59       +4     
  Lines        4073     4773     +700     
==========================================
+ Hits         3743     4343     +600     
- Misses        330      430     +100     

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[github-actions]

Before [6a9e4da]	After [5e0da80]	Ratio	Benchmark (Parameter)
686±40μs	754±60μs	1.1	benchmarks.TimeSuite.time_fnu_to_flam
19.0±0.3ms	19.6±0.2ms	1.03	benchmarks.TimeSuite.time_make_and_evaluate_static_sed
19.2±0.2ms	19.6±0.3ms	1.02	benchmarks.TimeSuite.time_chained_evaluate_sed
9.41±0.2ms	9.64±0.4ms	1.02	benchmarks.TimeSuite.time_evaluate_salt3_model
87.3±1μs	89.3±1μs	1.02	benchmarks.TimeSuite.time_make_and_evaluate_step_model
45.1±0.4μs	45.9±0.8μs	1.02	benchmarks.TimeSuite.time_make_new_salt3_model
555±7μs	564±20μs	1.01	benchmarks.TimeSuite.time_apply_passbands
11.0±0.1ms	11.1±0.07ms	1.01	benchmarks.TimeSuite.time_make_evaluate_constant_sed_model
12.6±0.3μs	12.7±0.1μs	1.01	benchmarks.TimeSuite.time_sample_x1_from_hostmass
7.62±0.1ms	7.60±0.1ms	1	benchmarks.TimeSuite.time_apply_white_noise

Click here to view all benchmarks.