Allow compensation rate within TOU tiers

Is your feature request related to a problem? Please describe.

SAM currently only allows a flat compensation rate that applies for net metering. From the documentation:

For the purpose of annual net excess compensation, monthly excess generation is calculated from the monthly total generation and load, regardless of time-of-use (TOU) periods.

PECO has net metering, but on their TOU rate plan, the annual cash out is done at the "price to compare" within each TOU tier. See https://www.peco.com/cdn/assets/v3/assets/blt1b5616c79bacadb4/blte7bf67602d7799ef/64cb648f5b39c52180713adf/S1-Solar_Net_Metering_Time_of_Use_10212021.pdf?branch=prod_alias.

Describe the solution you'd like

It would be helpful to be able to specify the compensation rate within the same tiers that are used for electricity charges from the grid. SAM seems to already bank everything separately, so I hope this would be a straightforward improvement.

Describe alternatives you've considered

Using one of the other compensation types (e.g. net billing or net metering with $ credits), but I don't see a way to accomplish it (at least certainly not simply).

No files, tests, or entry points are identified. Start by locating the net-metering compensation and TOU-tier handling, then compare how annual cash-out rates are selected. Done means compensation can be specified per existing TOU tier without changing other compensation modes.