[wpilib] Add AnalogEncoder(int) ctor (#3273)

wpilibc/src/main/native/cpp/AnalogEncoder.cpp

@@ -12,6 +12,9 @@
 
 using namespace frc;
 
+AnalogEncoder::AnalogEncoder(int channel)
+    : AnalogEncoder(std::make_shared<AnalogInput>(channel)) {}
+
 AnalogEncoder::AnalogEncoder(AnalogInput& analogInput)
     : m_analogInput{&analogInput, NullDeleter<AnalogInput>{}},
       m_analogTrigger{m_analogInput.get()},

wpilibc/src/main/native/include/frc/AnalogEncoder.h

@@ -26,6 +26,13 @@ class AnalogEncoder : public ErrorBase,
                       public Sendable,
                       public SendableHelper<AnalogEncoder> {
  public:
+  /**
+   * Construct a new AnalogEncoder attached to a specific AnalogIn channel.
+   *
+   * @param channel the analog input channel to attach to
+   */
+  explicit AnalogEncoder(int channel);
+
   /**
    * Construct a new AnalogEncoder attached to a specific AnalogInput.
    *

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

@@ -23,6 +23,15 @@ public class AnalogEncoder implements Sendable, AutoCloseable {
   protected SimDevice m_simDevice;
   protected SimDouble m_simPosition;
 
+  /**
+   * Construct a new AnalogEncoder attached to a specific AnalogIn channel.
+   *
+   * @param channel the analog input channel to attach to
+   */
+  public AnalogEncoder(int channel) {
+    this(new AnalogInput(channel));
+  }
+
   /**
    * Construct a new AnalogEncoder attached to a specific AnalogInput.
    *