Add EBL models

[cosimoNigro]

This PR request adds to the Absorption sub-module the absorption from three different EBL models.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 1.17%.

Quality metrics	Before	After	Change
Complexity	1.17 ⭐	1.13 ⭐	-0.04 👍
Method Length	98.50 🙂	91.37 🙂	-7.13 👍
Working memory	13.26 😞	13.05 😞	-0.21 👍
Quality	60.96% 🙂	62.13% 🙂	1.17% 👍

Other metrics	Before	After	Change
Lines	528	593	65

Changed files	Quality Before	Quality After	Quality Change
agnpy/absorption/absorption.py	61.90% 🙂	64.96% 🙂	3.06% 👍
agnpy/tests/test_absorption.py	64.57% 🙂	64.25% 🙂	-0.32% 👎
agnpy/tests/utils.py	53.14% 🙂	52.14% 🙂	-1.00% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
agnpy/tests/utils.py	make_comparison_plot	5 ⭐	309 ⛔	24 ⛔	33.80% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/absorption/absorption.py	Absorption.opacity_disk	3 ⭐	231 ⛔	19 ⛔	41.72% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/absorption/absorption.py	tau_disk_finke_2016	0 ⭐	171 😞	18 ⛔	49.98% 😞	Try splitting into smaller methods. Extract out complex expressions
agnpy/absorption/absorption.py	Absorption.opacity_shell_blr	0 ⭐	147 😞	13 😞	58.04% 🙂	Try splitting into smaller methods. Extract out complex expressions
agnpy/tests/test_absorption.py	TestAbsorption.test_absorption_disk_reference_tau	0 ⭐	173 😞	11 😞	58.76% 🙂	Try splitting into smaller methods. Extract out complex expressions

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[codecov]

Codecov Report

Merging #55 (513a8a4) into master (3652786) will increase coverage by 0.11%.
The diff coverage is 97.77%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   93.99%   94.11%   +0.11%     
==========================================
  Files          30       30              
  Lines        1681     1715      +34     
==========================================
+ Hits         1580     1614      +34     
  Misses        101      101              

Flag	Coverage Δ
unittests	94.11% <97.77%> (+0.11%)	⬆️

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Impacted Files	Coverage Δ
agnpy/absorption/absorption.py	99.25% <96.55%> (-0.75%)	⬇️
agnpy/tests/test_absorption.py	100.00% <100.00%> (ø)
agnpy/tests/utils.py	100.00% <100.00%> (+1.72%)	⬆️

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