Add site backtest script

[Sukh-P]

Pull Request

Description

Adding a site PVNet backtest script which has been modified from the original script to be able to create a backtest for specific PV sites

How Has This Been Tested?

This has been tested by the running the script and verifying the outputs

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[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 58.55%. Comparing base (5f5d154) to head (2202aa3). Report is 58 commits behind head on main.

:exclamation: Current head 2202aa3 differs from pull request most recent head 91253e3. Consider uploading reports for the commit 91253e3 to get more accurate results

Files	Patch %	Lines
pvnet/utils.py	50.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## ========================================== - Coverage 61.39% 58.55% -2.85% ========================================== Files 28 29 +1 Lines 1790 1836 +46 ========================================== - Hits 1099 1075 -24 - Misses 691 761 +70 ```

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