February 2025 Release- Pricetaker tasks

[adam-a-a]

February 2025 Release:
**Finish PR #1358 **
The PriceTaker class must still be merged into the main codebase. This class and associated workflow can be useful for projects related to DISPATCHES-type work. For example, modeling flexible desalination in WaterTAP is of interest, and we could make use of the Pricetaker class.

Here is a to-do list based on @andrewlee94 's suggested changes and @radhakrishnatg 's suggestions for enhancement.

• Add technical reference for Pricetaker class @MarcusHolly Price taker model for DISPATCHES, Rehashed #1358

• Add test file for design_and_operation_model.py @radhakrishnatg

• Strengthen unit tests across the board (e.g., test add_startup_shutdown and other methods); consider simpler dummy cases for unit testing all the methods in isolation @adam-a-a

• Enable addition of startup, shutdown, ramping, etc. constraints when representative days (as opposed to full-year price signal) are used

• Enable addition of cash flow/cost expressions when representative days are used