use kaiming initialization for conv layers

[pattonw]

use kaiming initialization for convolutional layers in dacapo models.
This is important for our standard UNets since the default initialization is pretty terrible when following convolutions with ReLU's.
might want to move this into individual architectures if you are playing around with non ReLU activations

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (39915ac) 64.31% compared to head (c140922) 64.35%.
Report is 25 commits behind head on main.

❗ Current head c140922 differs from pull request most recent head f9a58bd. Consider uploading reports for the commit f9a58bd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   64.31%   64.35%   +0.03%     
==========================================
  Files         181      181              
  Lines        5479     5482       +3     
==========================================
+ Hits         3524     3528       +4     
+ Misses       1955     1954       -1     

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[rhoadesScholar]

Temp fix, I agree. But an important one.