preliminary version of standardization of the calc metrics

[cmgosnell]

PR Overview

Try to make both the transform and explosion step use the same frickin code to validate the calculations.

PR Checklist

• Merge the most recent version of the branch you are merging into (probably dev).
• All CI checks are passing. Run tests locally to debug failures
• Make sure you've included good docstrings.
• For major data coverage & analysis changes, run data validation tests
• Include unit tests for new functions and classes.
• Defensive data quality/sanity checks in analyses & data processing functions.
• Update the release notes and reference reference the PR and related issues.
• Do your own explanatory review of the PR to help the reviewer understand what's going on and identify issues preemptively.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (4e5d603) 88.6% compared to head (80035d1) 88.5%.
Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##             dev   #2880     +/-   ##
=======================================
- Coverage   88.6%   88.5%   -0.1%     
=======================================
  Files         90      90             
  Lines      10833   10805     -28     
=======================================
- Hits        9600    9573     -27     
+ Misses      1233    1232      -1     

Files	Coverage Δ
src/pudl/output/ferc1.py	88.7% <100.0%> (-0.6%)	⬇️
src/pudl/transform/ferc1.py	96.6% <100.0%> (+<0.1%)	⬆️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.