Issue/rm nowcasting utils

[peterdudfield]

Pull Request

Description

• remove nowcasting_utils
• copy weightedLoss class across + tests Fixes #93

How Has This Been Tested?

CI tests + new ones

• [x] Yes

Checklist:

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

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (1848eea) 49.93% compared to head (bd79763) 50.51%. Report is 1 commits behind head on main.

Files	Patch %	Lines
pvnet/models/base_model.py	25.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #100 +/- ## ========================================== + Coverage 49.93% 50.51% +0.57% ========================================== Files 23 23 Lines 1642 1663 +21 ========================================== + Hits 820 840 +20 - Misses 822 823 +1 ```

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