Instantiate AstroPredictor with in-memory model weights

[drewoldag]

Prior to this change model weights were only loaded from a file. However, to support wrapping with RAIL, we need to be able to accept the actual model weight dictionary directly (from the ceci DataStore).

This work allows the user to pass either a file path or a model weight dictionary, or rather a checkpoint, when initializing AstroPredictor.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (63ccf58) 12.81% compared to head (d063ede) 12.80%.

Files	Patch %	Lines
src/deepdisc/astrodet/astrodet.py	0.00%	4 Missing ⚠️
src/deepdisc/inference/predictors.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   12.81%   12.80%   -0.01%     
==========================================
  Files          22       22              
  Lines        3465     3467       +2     
==========================================
  Hits          444      444              
- Misses       3021     3023       +2     

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[grantmerz]

This looks good to me. I see the checkpointer code is buried in fvcore, but nice that the fix is a simple line change