PSY Remaining TODOs for Second Cost Refactor

[GabrielKS]

This is a list of TODOs that remain unfinished from https://github.com/NREL-Sienna/PowerSystems.jl/pull/1071, they should all be addressed before PSY 4 is released.

• [ ] Make other fields of MarketBidCost time series, see https://github.com/NREL-Sienna/PowerSystems.jl/pull/1071#discussion_r1579880930
• [ ] Verify correctness of power_system_table_data.jl, possibly write new tests (cmd-F Strange math, see also https://github.com/NREL-Sienna/PowerSystems.jl/pull/1071#discussion_r1548537062)
• [ ] Nail down naming of everything to both conform to power systems domain conventions and not be misleading about what things are
• [ ] Nail down what is part of the public interface (e.g., just the cost aliases or ValueCurves?)
• [ ] Do this to support 3 -> 4 system conversions: https://github.com/NREL-Sienna/PowerSystems.jl/blob/234936ef5e06c47388d560511ec6c817f4f30864/src/data_format_conversions.jl#L107
• [ ] Minor TODO(?): https://github.com/NREL-Sienna/PowerSystems.jl/blob/234936ef5e06c47388d560511ec6c817f4f30864/test/test_constructors.jl#L24
• [ ] Minor TODO: https://github.com/NREL-Sienna/PowerSystems.jl/blob/234936ef5e06c47388d560511ec6c817f4f30864/src/PowerSystems.jl#L553
• [ ] Fill in TODOs in https://github.com/NREL-Sienna/PowerSystems.jl/blob/234936ef5e06c47388d560511ec6c817f4f30864/docs/src/modeler_guide/cost_functions.md
• [ ] Address https://github.com/NREL-Sienna/PowerSystems.jl/issues/1048
• [ ] Already covered by other items, but https://github.com/NREL-Sienna/PowerSystems.jl/blob/234936ef5e06c47388d560511ec6c817f4f30864/src/models/cost_functions/cost_aliases.jl#L84

[jd-lara]

On the get_points, it isn't too much of a problem since the geographic info uses GeoJSON blobs.

[jd-lara]

#1081 Is also part of this list

[GabrielKS]

wrt "Nail down naming of everything," would someone with a power systems background like to review my naming?

[jd-lara]

@GabrielKS can you update the list and close if this is pretty much ready please?