Add wastewater data to pyrenew_hew_data

[sbidari]

Added prep_ww_data.py: extracting, cleaning, and preprocessing NWSS data.
Updated prep_data.py: incorporate wastewater data into the training data.
Updated pyrenew_hew_data.py: downstream processing of wastewater data.
Added a test in test_pyrenew_hew_data.py
Misc:
Renamed some variables in the wastewater model for clarity.
Standardized date handling using datetime.date.

To do: Update path for NWSS data

[codecov]

Codecov Report

Attention: Patch coverage is 63.19444% with 53 lines in your changes missing coverage. Please review.

Project coverage is 27.06%. Comparing base (c6e0fc1) to head (eb61c98).

Files with missing lines	Patch %	Lines
pipelines/prep_ww_data.py	18.18%	36 Missing ⚠️
pyrenew_hew/pyrenew_hew_data.py	86.17%	13 Missing ⚠️
pipelines/build_pyrenew_model.py	0.00%	2 Missing ⚠️
pipelines/prep_data.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #317      +/-   ##
==========================================
+ Coverage   24.47%   27.06%   +2.59%     
==========================================
  Files          22       23       +1     
  Lines        1704     1836     +132     
==========================================
+ Hits          417      497      +80     
- Misses       1287     1339      +52     

Flag	Coverage Δ
hewr	41.68% <ø> (ø)
pipelines	5.85% <20.00%> (+1.18%)	⬆️
pyrenew_hew	35.76% <86.17%> (+7.79%)	⬆️

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[dylanhmorris]

This is looking very good, thanks @sbidari! A few questions and suggestions.

[sbidari]

Ready for re-review! @damonbayer @dylanhmorris