Ocf data sampler

[peterdudfield]

Pull Request

Description

• Upgrade to ocf_data_sampler
• keep old ocf_datapipes for legacy
• added new PVNET models
• Keep old PVNET DA model

Helps - openclimatefix/ocf-data-sampler#7

How Has This Been Tested?

CI tests

• Yes

Checklist:

• 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
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[dfulu]

@peterdudfield I've added the newly trained models to this and took out the fake GSP data since the new ocf-data-sampler doesn't require it anymore