Change to one lead time per forward pass

[jacobbieker]

Pull Request

Description

Changes MetNet and MetNet2 to only predict a single lead time at a time, to predict on all, then need to do multiple forward passes.

How Has This Been Tested?

Unit Tests

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #20 (f50ad78) into main (f76911f) will increase coverage by 0.13%. The diff coverage is 96.29%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   84.89%   85.03%   +0.13%     
==========================================
  Files          15       15              
  Lines         576      568       -8     
==========================================
- Hits          489      483       -6     
+ Misses         87       85       -2     

Impacted Files	Coverage Δ
metnet/models/metnet2.py	94.23% <95.83%> (-0.22%)	:arrow_down:
metnet/models/metnet.py	94.91% <100.00%> (-0.33%)	:arrow_down:
metnet/layers/ConvGRU.py	93.22% <0.00%> (+1.69%)	:arrow_up:

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