Add PV History Datapipe with spaced out history

[jacobbieker]

Detailed Description

In the XGBoost and site-level predictions, taking the PV history from an hour behind and 24 hour lag is useful. Currently the datapipes is more setup for grabbing continuous history, and having a selecting one that can history in larger jumps the further in the past we go could be very helpful.

Context

Its been useful for the tree models and might be useful for other ML models

Possible Implementation

Make one in the select that selects the history more spaced out. This could be exponential drop off as you go further back. Or option to give list of timestamps that is wanted.