[hal] Unify PWM simulation Speed, Position, and Raw (#5277)

Setting one will set the others, like it does in real hardware.
Add tests for boundary conditions and conversions.
Update PWM sendable implementation to include all forms.
Fixes #5264
Fixes #3606

wpilibj/src/main/java/edu/wpi/first/wpilibj/PWM.java

@@ -253,5 +253,7 @@ public class PWM implements Sendable, AutoCloseable {
     builder.setSafeState(this::setDisabled);
     builder.addDoubleProperty(
         "Value", this::getPulseTimeMicroseconds, value -> setPulseTimeMicroseconds((int) value));
+    builder.addDoubleProperty("Speed", this::getSpeed, this::setSpeed);
+    builder.addDoubleProperty("Position", this::getPosition, this::setPosition);
   }
 }