Pf coils accounting pr

[grmtrkngtn]

Description

Closes #972 #4089

pdates pfpwr equation to account for additional components in pf power management: busbar, power supply and storage system.

We have added separate functions to calculate the power loss for each component.
pfpwr has been adapted to use these new functions to account for the pf power supply - previously they were lumped into one value.
A mild refactor of pfpwr function (modularising it a bit, renaming some variables)

from #972 and #4089

Checklist

I confirm that I have completed the following checks:

• [x ] My changes follow the PROCESS style guide
• [ x] I have justified any large differences in the regression tests caused by this pull request in the comments.
• [ x] I have added new tests where appropriate for the changes I have made.
• [ x] If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• [x ] If I have made documentation changes, I have checked they render correctly.
• [x ] I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.63%. Comparing base (2899a60) to head (6b6d138).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4182      +/-   ##
==========================================
+ Coverage   49.56%   49.63%   +0.06%     
==========================================
  Files         148      148              
  Lines       29719    29757      +38     
==========================================
+ Hits        14731    14769      +38     
  Misses      14988    14988              

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[timothy-nunn]

Moved from #4089 (which was approved) due to rebase