[wpimath] Deprecate RamseteController (#6494)

LTVUnicycleController is a drop-in replacement with better tuning knobs.

The RamseteCommand examples were removed instead of retrofitted with
LTVUnicycleController because we're planning on removing the command
controller classes anyway, so it would be wasted effort. The
SimpleDifferentialDriveSimulation example shows direct
LTVUnicycleController usage.

wpimath/src/main/java/edu/wpi/first/math/controller/RamseteController.java

@@ -48,7 +48,9 @@ public class RamseteController {
    *     aggressive like a proportional term.
    * @param zeta Tuning parameter (0 rad⁻¹ < zeta < 1 rad⁻¹) for which larger values provide
    *     more damping in response.
+   * @deprecated Use LTVUnicycleController instead.
    */
+  @Deprecated(since = "2024", forRemoval = true)
   public RamseteController(double b, double zeta) {
     m_b = b;
     m_zeta = zeta;
@@ -57,7 +59,10 @@ public class RamseteController {
   /**
    * Construct a Ramsete unicycle controller. The default arguments for b and zeta of 2.0 rad²/m²
    * and 0.7 rad⁻¹ have been well-tested to produce desirable results.
+   *
+   * @deprecated Use LTVUnicycleController instead.
    */
+  @Deprecated(since = "2024", forRemoval = true)
   public RamseteController() {
     this(2.0, 0.7);
   }