Added KilopoundForceFeetPerDegrees variant to RotationalStiffness

[dschuermans]

Added KilopoundForceFeetPerDegrees variant to RotationalStiffness, along with PoundForceFeetPerDegrees.

Used to do it through extension methods:

Figured i add it to the library, for the benefit of others looking for an imperial variant.

Not much to find in terms of converters, so I used google's:

[codecov-io]

Codecov Report

Merging #749 into master will increase coverage by 1.06%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #749 +/- ##
==========================================
+ Coverage 61.92% 62.98% +1.06% 
==========================================
Files 171 270 +99 Lines 38457 39559 +1102 ==========================================
+ Hits 23814 24916 +1102 
Misses 14643 14643

Impacted Files	Coverage Δ
UnitsNet/GeneratedCode/UnitAbbreviationsCache.g.cs	100% <ø> (ø)	⬆️
UnitsNet/GeneratedCode/UnitConverter.g.cs	100% <100%> (ø)	⬆️
.../GeneratedCode/Quantities/RotationalStiffness.g.cs	51.98% <100%> (+2.33%)	⬆️
...ns/GeneratedCode/NumberToLuminosityExtensions.g.cs	100% <0%> (ø)
...nsions/GeneratedCode/NumberToEnergyExtensions.g.cs	100% <0%> (ø)
...ensions/GeneratedCode/NumberToForceExtensions.g.cs	100% <0%> (ø)
...Code/NumberToElectricCurrentDensityExtensions.g.cs	100% <0%> (ø)
...GeneratedCode/NumberToElectricFieldExtensions.g.cs	100% <0%> (ø)
...neratedCode/NumberToSpecificEntropyExtensions.g.cs	100% <0%> (ø)
... and 94 more

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[angularsen]

Release UnitsNet/4.45.0 · angularsen/UnitsNet