Add combinations of Density, Area, and LinearDensity operators

[trb5016]

Density = LinearDensity / Area
LinearDensity = Density * Area
LinearDensity = Area * Density
Area = LinearDensity / Density

Hope everyone's staying safe.

[angularsen]

Great work, just a minor suggestion.

[codecov-io]

Codecov Report

Merging #772 into master will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #772      +/-   ##
==========================================
+ Coverage   63.44%   63.53%   +0.08%     
==========================================
  Files         277      278       +1     
  Lines       41055    41147      +92     
==========================================
+ Hits        26049    26141      +92     
  Misses      15006    15006              

Impacted Files	Coverage Δ
UnitsNet/CustomCode/Quantities/Area.extra.cs	100.00% <100.00%> (ø)
UnitsNet/CustomCode/Quantities/Density.extra.cs	66.66% <100.00%> (+4.16%)	⬆️
...tsNet/CustomCode/Quantities/LinearDensity.extra.cs	100.00% <100.00%> (ø)
UnitsNet/GeneratedCode/UnitConverter.g.cs	100.00% <0.00%> (ø)
...s/GeneratedCode/NumberToTemperatureExtensions.g.cs	100.00% <0.00%> (ø)
...eratedCode/NumberToTemperatureDeltaExtensions.g.cs	100.00% <0.00%> (ø)
UnitsNet/GeneratedCode/Quantities/Temperature.g.cs	56.32% <0.00%> (+0.98%)	⬆️
...Net/GeneratedCode/Quantities/TemperatureDelta.g.cs	61.82% <0.00%> (+5.79%)	⬆️

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[angularsen]

Thanks, nuget on the way.
Release UnitsNet/4.56.0 · angularsen/UnitsNet