Add SZ likelihood to SOLikeT

[emilymmoser]

This will add a likelihood for SZ analysis of stacked profiles.

In the main script, szlike.py, there are separate classes for three different models: kSZ and tSZ for the GNFW model, and the OBB model.

Note: The current set up is specific in places (e.g., two-halo term) to the CMASS galaxy sample as used in the ACT analysis, so some work on generalization will need to be done in the future.

[itrharrison]

@emilymmoser happy for you to mark as ready for review whenever you wish 👍

[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.95201% with 409 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.37%. Comparing base (52be7b3) to head (de3f166).

Files with missing lines	Patch %	Lines
soliket/szlike/obb.py	16.77%	268 Missing ⚠️
soliket/szlike/projection_functions.py	55.39%	85 Missing and 6 partials ⚠️
soliket/szlike/beam.py	43.24%	21 Missing ⚠️
soliket/szlike/szlike.py	72.46%	19 Missing ⚠️
soliket/szlike/hankel_transform_class.py	82.85%	3 Missing and 3 partials ⚠️
soliket/szlike/cosmo.py	86.20%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #91       +/-   ##
===========================================
- Coverage   74.10%   36.37%   -37.73%     
===========================================
  Files          35       44        +9     
  Lines        1641     4594     +2953     
  Branches      146      416      +270     
===========================================
+ Hits         1216     1671      +455     
- Misses        371     2858     +2487     
- Partials       54       65       +11     

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