Likelihood modules

[santiagocasas]

Closes likelihood module task

Changes proposed in this pull request:

• likelihood module for photo
• likelihood module for spectro

Before submitting

• I've read and followed all steps in the Making a pull request
  section of the CONTRIBUTING docs.
• I've updated or added any relevant docstrings following the syntax described in the
  Writing docstrings section of the CONTRIBUTING docs.
• If this PR fixes a bug, I've added a test that will fail without my fix.
• If this PR adds a new feature, I've added tests that sufficiently cover my new functionality.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 59.84252% with 102 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.79%. Comparing base (50ac673) to head (2f61613).
⚠️ Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
cosmicfishpie/likelihood/spectro_like.py	20.89%	53 Missing ⚠️
cosmicfishpie/likelihood/photo_like.py	77.44%	30 Missing ⚠️
cosmicfishpie/likelihood/base.py	63.26%	18 Missing ⚠️
cosmicfishpie/analysis/fishconsumer.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   34.95%   36.79%   +1.83%     
==========================================
  Files          30       34       +4     
  Lines        5627     5966     +339     
==========================================
+ Hits         1967     2195     +228     
- Misses       3660     3771     +111     

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[santiagocasas]

@Sefa76 would you be so kind to review this PR quite superficially? thanks!

[Sefa76]

Looks good, i left a comment but that's more of a discussion. Can be merged as is