[wpimath] Rotation2d: add Measure<Angle> getter (Java) (#6492)

wpimath/src/main/java/edu/wpi/first/math/geometry/Rotation2d.java

@@ -187,6 +187,15 @@ public class Rotation2d
         m_cos * other.m_cos - m_sin * other.m_sin, m_cos * other.m_sin + m_sin * other.m_cos);
   }
 
+  /**
+   * Returns the measure of the Rotation2d.
+   *
+   * @return The measure of the Rotation2d.
+   */
+  public Measure<Angle> getMeasure() {
+    return Radians.of(getRadians());
+  }
+
   /**
    * Returns the radian value of the Rotation2d.
    *