Add revolutions per second squared unit to rotational acceleration (#665)

* Add RevolutionsPerSecondPerSecond unit to RotationalAcceleration

* Regenerate code

* Add test stub for RevolutionsPerSecondPerSecond

* Rename RevolutionsPerSecondPerSecond to RevolutionPerSecondSquared and change test stub to use constant value

Constant value taken from https://www.smartconversion.com/unit_conversion/angular_acceleration_converter.aspx

Author: bradtglass

Common/UnitDefinitions/RotationalAcceleration.json

@@ -41,6 +41,18 @@
           "Abbreviations": [ "rpm/s" ]
         }
       ]
+    },
+    {
+      "SingularName": "RevolutionPerSecondSquared",
+      "PluralName": "RevolutionsPerSecondSquared",
+      "FromUnitToBaseFunc": "(2*Math.PI)*x",
+      "FromBaseToUnitFunc": "(1/(2*Math.PI))*x",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "r/s²" ]
+        }
+      ]
     }
   ]
 }

UnitsNet.Tests/CustomCode/RotationalAccelerationTests.cs

@@ -30,5 +30,6 @@ public class RotationalAccelerationTests : RotationalAccelerationTestsBase
         protected override double DegreesPerSecondSquaredInOneRadianPerSecondSquared => 180 / Math.PI;
         protected override double RadiansPerSecondSquaredInOneRadianPerSecondSquared => 1;
         protected override double RevolutionsPerMinutePerSecondInOneRadianPerSecondSquared => 9.549296586;
+        protected override double RevolutionsPerSecondSquaredInOneRadianPerSecondSquared=> 0.159154943091895;
     }
 }