Add helper data PyrenewHEWData class to hold input data to PyrenewHewModels

[dylanhmorris]

Main change

Add PyrenewHEWData

This:

• facilitates date math
• removes some if is None conditionals from the main model.sample() code.
• Has a simple to_forecast_data() transformation helper for posterior prediction.

Additional changes:

• Removes create_pyrenew_hew_model_from_stan_data() and hosp_only_ww_model/pyrenew_hew_model.qmd, closing Remove create_pyrenew_hew_model_from_stan_data? #280

[codecov]

Codecov Report

Attention: Patch coverage is 31.66667% with 82 lines in your changes missing coverage. Please review.

Project coverage is 22.14%. Comparing base (bc76d59) to head (4131e81).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pyrenew_hew/pyrenew_hew_data.py	44.77%	37 Missing ⚠️
pyrenew_hew/pyrenew_hew_model.py	20.00%	32 Missing ⚠️
pipelines/build_pyrenew_model.py	0.00%	10 Missing ⚠️
pipelines/generate_predictive.py	0.00%	2 Missing ⚠️
pipelines/fit_pyrenew_model.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #283      +/-   ##
==========================================
+ Coverage   20.67%   22.14%   +1.47%     
==========================================
  Files          21       22       +1     
  Lines        1572     1603      +31     
==========================================
+ Hits          325      355      +30     
- Misses       1247     1248       +1     

Flag	Coverage Δ
hewr	47.68% <ø> (ø)
pipelines	0.00% <0.00%> (ø)
pyrenew_hew	24.53% <35.51%> (+5.27%)	⬆️

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[sbidari]

This looks mostly good to me. Just few comments/questions for clarification.

[damonbayer]

Left many comments, none of which are mandatory.