Use hdf5

[marcpaterno]

Description

This PR adds a tool to translate between FITS and HDF5 format for SACC files.
It introduces a general SACC reading function that deals with both file formats.
It also switches most tests, tutorials and examples to use HDF5 rather than FITS files for SACC data.

Type of change

• New feature (non-breaking change which adds functionality)
• Refactoring

Checklist:

The following checklist will make sure that you are following the code style and
guidelines of the project as described in the
contributing page.

• I have run bash pre-commit-check and fixed any issues
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have 100% test coverage for my changes (please check this after the CI system has verified the coverage)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (99805a5) to head (116ca15).
⚠️ Report is 96 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #559   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files          50       50           
  Lines        5116     5131   +15     
  Branches      580      581    +1     
=======================================
+ Hits         5116     5131   +15     

Files with missing lines	Coverage Δ
firecrown/ccl_factory.py	100.0% <ø> (ø)
firecrown/likelihood/factories.py	100.0% <100.0%> (ø)
firecrown/likelihood/two_point.py	100.0% <ø> (ø)
firecrown/likelihood/weak_lensing.py	100.0% <ø> (ø)
firecrown/metadata_functions.py	100.0% <ø> (ø)

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