Add option to save WindNet batches

[jacobbieker]

Pull Request

Description

Adds Windnet batch creation for wind forecasting

Fixes #

How Has This Been Tested?

Unit test

• [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
• [x] 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[bot]]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (7eee4bb) 49.93% compared to head (2fdb5d9) 50.08%.

Files	Patch %	Lines
pvnet/data/wind_datamodule.py	52.17%	22 Missing :warning:
pvnet/data/utils.py	83.33%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #99 +/- ## ========================================== + Coverage 49.93% 50.08% +0.14% ========================================== Files 23 26 +3 Lines 1642 1691 +49 ========================================== + Hits 820 847 +27 - Misses 822 844 +22 ```

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