[wpimath] Java: add static instantiations of common rotations (#6563)

C++ doesn't need this because it supports value types, which are much
cheaper to construct. constexpr is also available to make construction
zero-cost.

wpimath/src/main/java/edu/wpi/first/math/ComputerVisionUtil.java

@@ -27,7 +27,7 @@ public final class ComputerVisionUtil {
    *     either be a constant for a rigidly mounted camera, or variable if the camera is mounted to
    *     a turret. If the camera was mounted 3 inches in front of the "origin" (usually physical
    *     center) of the robot, this would be new Transform3d(Units.inchesToMeters(3.0), 0.0, 0.0,
-   *     new Rotation3d()).
+   *     Rotation3d.kZero).
    * @return The robot's field-relative pose.
    */
   public static Pose3d objectToRobotPose(