Variable Cost Refactor Part 2: PowerSimulations

[GabrielKS]

The second part of a significant refactor of Sienna cost data structures (part 1 is here). The main focus here is to bring PowerSimulations.jl up to date with the elimination of VariableCost in favor of FunctionData. That entails these changes in InfrastructureSystems:

• Make PiecewiseLinearPointData use NamedTuples so it's even harder to mix up x and y
• Add the notion of "raw data" to support storing data from FunctionData in other containers, like the ones in PowerSimulations

On the latter point — does this functionality belong in PowerSimulations?

Tests pass:

[GabrielKS]

The group of four PRs this is a part of:

1. Variable Cost Refactor Part 2: PowerSimulations #332
2. Variable Cost Refactor Part 2: PowerSimulations PowerSystems.jl#1059
3. Variable Cost Refactor Part 2: PowerSimulations PowerSystemCaseBuilder.jl#73
4. Variable Cost Refactor Part 2: PowerSimulations PowerSimulations.jl#1061

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.09%. Comparing base (7f0d636) to head (8155747).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
+ Coverage   79.99%   80.09%   +0.10%     
==========================================
  Files          54       54              
  Lines        4319     4336      +17     
==========================================
+ Hits         3455     3473      +18     
+ Misses        864      863       -1     

Flag	Coverage Δ
unittests	80.09% <100.00%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/common.jl	100.00% <ø> (ø)
src/function_data.jl	98.91% <100.00%> (+0.32%)	⬆️

... and 3 files with indirect coverage changes

[jd-lara]

Use Alias instead of declaring the NamedTuple everywhere.