refactor: add compare module, move Grid/Scenario check functions from PostREISE to PowerSimData

[danielolsen]

Pull Request doc

Purpose

• Add a new module, powersimdata.design.compare, to consolidate code which compares Grid data tables.
• In the process of moving code from PostREISE to PowerSimData, move associated check functions which do not depend on PCM outputs.

What the code is doing

• powersimdata.design.compare gets comparison logic that had been performed elsewhere in PowerSimData or PostREISE.
• powersimdata.design.investment uses the newly consolidated comparison logic.
• powersimdata.input.check and powersimdata.scenario.check get the Grid and Scenario check functions (with associated tests).

Testing

Existing unit tests still pass. The existing comparison logic in PowerSimData was untested, but now has a path to getting tests, since it is separated from the broader investment cost calculations.

Where to look

The only real new code is in powersimdata.design.compare.generation, since it is more robust than what we had before in calculate_gen_inv_costs. Everything else is just moved from elsewhere, with references updated.

Time estimate

15-30 minutes.

[BainanXia]

This is nice. Thanks.

[danielolsen]

Per discussion at Breakthrough-Energy/PostREISE#310, we probably also want to move postreise.analyze.helpers into powersimdata.input.helpers. Do we want to do this in this PR, or a follow-up?

[rouille]

Per discussion at Breakthrough-Energy/PostREISE#310, we probably also want to move postreise.analyze.helpers into powersimdata.input.helpers. Do we want to do this in this PR, or a follow-up?

Your call