refactor infectionswithfeedback.py to allow shared infection feedback strength across sites

[sbidari]

Used jnp.broadcast instead of padding to get desired shape for infection_feedback_strength. This allows flexibility of having shared or individual infection feedback strength across different sites/sub populations which the previous version did not.

This change also makes pad_edges_to_match function from the arrayutils unnecessary but I left it for now.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.40%. Comparing base (9bc3dae) to head (e4a28ab).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
pyrenew/latent/infectionswithfeedback.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #470      +/-   ##
==========================================
- Coverage   94.41%   94.40%   -0.02%     
==========================================
  Files          42       42              
  Lines        1003     1000       -3     
==========================================
- Hits          947      944       -3     
  Misses         56       56              

Flag	Coverage Δ
unittests	94.40% <50.00%> (-0.02%)	⬇️

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[dylanhmorris]

This is a much better solution, thanks @sbidari!