Add weekly_to_daily functionality, move time handling functions to their own module

[dylanhmorris]

Note that this will introduce a breaking change (since from pyrenew.convolve import daily_to_weekly will need to become from pyrenew.time import daily_to_weekly. We could go through a deprecation cycle but I think Pyrenew is a bit young for that. @damonbayer/@sbidari lmk if you disagree.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 6 lines in your changes missing coverage. Please review.

Project coverage is 96.00%. Comparing base (bbaf1b9) to head (3178cfc).

Files with missing lines	Patch %	Lines
pyrenew/time.py	76.92%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
- Coverage   96.56%   96.00%   -0.57%     
==========================================
  Files          41       42       +1     
  Lines         962      975      +13     
==========================================
+ Hits          929      936       +7     
- Misses         33       39       +6     

Flag	Coverage Δ
unittests	96.00% <76.92%> (-0.57%)	⬇️

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[sbidari]

Why isn't the weekly_values adjusted before repeating to create daily values in weekly_to_daily?

[dylanhmorris]

Why isn't the weekly_values adjusted before repeating to create daily values in weekly_to_daily?

For weekly_to_daily, all weekly values have to be assumed complete. So the key thing is to ensure that any partial starting week is only partially tiled, which the final [offset: ] operation accomplishes. If the user wishes to trim days off the ending week, they must do so manually. I suppose we could add an output_data_last_dow, but I'm not sure whether or not it would make the API clearer. Thoughts?