Add quantity LinearPowerDensity

[trb5016]

Adding a new quantity Linear Power Density. E.g., W/m.

Sometimes also referred to as "Linear Heat Generation Rate" or "Linear Heat Rate", the most generic term is "Linear Power Density".

I made the XmlDocRemarks wikipedia's linear density article, which is the same as the "LinearDensity" quantity. The article describes "Linear Density" generically, not just "Linear Mass Density" so it seemed most appropriate to use for Linear Power Density as well.

[codecov-io]

Codecov Report

Merging #768 into master will increase coverage by 0.09%.
The diff coverage is 71.2%.

@@            Coverage Diff             @@
##           master     #768      +/-   ##
==========================================
+ Coverage   63.34%   63.44%   +0.09%     
==========================================
  Files         275      277       +2     
  Lines       40534    41055     +521     
==========================================
+ Hits        25678    26049     +371     
- Misses      14856    15006     +150

Impacted Files	Coverage Δ
UnitsNet/GeneratedCode/UnitAbbreviationsCache.g.cs	100% <ø> (ø)	⬆️
UnitsNet/GeneratedCode/UnitConverter.g.cs	100% <100%> (ø)	⬆️
...atedCode/NumberToLinearPowerDensityExtensions.g.cs	100% <100%> (ø)
...t/GeneratedCode/Quantities/LinearPowerDensity.g.cs	66.28% <66.28%> (ø)
UnitsNet/GeneratedCode/Quantity.g.cs	81.45% <80%> (-0.02%)	⬇️

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[angularsen]

Perfect! Nuget on the way out.
Release UnitsNet/4.52.0 · angularsen/UnitsNet