Add ElectricPotentialChangeRate

[rennolaj]

Dear UnitsNet community,

We are very happy with the work you have done here, my colleagues and I are using this library
for a project, and we needed this specific unit as part of the requirements.

Please try to review the PR as soon as possible
Thank you in advance

Javier Rennola

[codecov-io]

Codecov Report

Merging #765 into master will increase coverage by 0.05%.
The diff coverage is 68.15%.

@@            Coverage Diff             @@
##           master     #765      +/-   ##
==========================================
+ Coverage   63.29%   63.34%   +0.05%     
==========================================
  Files         273      275       +2     
  Lines       40063    40534     +471     
==========================================
+ Hits        25357    25678     +321     
- Misses      14706    14856     +150

Impacted Files	Coverage Δ
UnitsNet/GeneratedCode/UnitAbbreviationsCache.g.cs	100% <ø> (ø)	⬆️
...NumberToElectricPotentialChangeRateExtensions.g.cs	100% <100%> (ø)
UnitsNet/GeneratedCode/UnitConverter.g.cs	100% <100%> (ø)	⬆️
...edCode/Quantities/ElectricPotentialChangeRate.g.cs	63.39% <63.39%> (ø)
UnitsNet/GeneratedCode/Quantity.g.cs	81.46% <80%> (-0.02%)	⬇️

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[angularsen]

Looks perfect to me, thanks!
I only adjusted the syntax of the test values slightly to a consistent scientific notation.

[angularsen]

Nuget on the way out.
Release UnitsNet/4.51.0 · angularsen/UnitsNet