[wpilib] Fix PowerDistribution.GetAllCurrents() (#6025)

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

@@ -113,6 +113,17 @@ public class PowerDistribution implements Sendable, AutoCloseable {
     return PowerDistributionJNI.getChannelCurrent(m_handle, channel);
   }
 
+  /**
+   * Query all currents of the PDP.
+   *
+   * @return The current of each channel in Amperes
+   */
+  public double[] getAllCurrents() {
+    double[] currents = new double[getNumChannels()];
+    PowerDistributionJNI.getAllCurrents(m_handle, currents);
+    return currents;
+  }
+
   /**
    * Query the current of all monitored channels.
    *