Add Animator.AnimatorPauseListener support (#1662)

Resolves #1644 by adding methods to LottieAnimationView and LottieDrawable
diff --git a/lottie/src/main/java/com/airbnb/lottie/LottieAnimationView.java b/lottie/src/main/java/com/airbnb/lottie/LottieAnimationView.java
index 70f0a9a..c5c38f6 100644
--- a/lottie/src/main/java/com/airbnb/lottie/LottieAnimationView.java
+++ b/lottie/src/main/java/com/airbnb/lottie/LottieAnimationView.java
@@ -24,6 +24,7 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RawRes;
+import androidx.annotation.RequiresApi;
 import androidx.appcompat.widget.AppCompatImageView;
 import androidx.core.view.ViewCompat;
 
@@ -759,6 +760,16 @@
     lottieDrawable.removeAllAnimatorListeners();
   }
 
+  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+  public void addAnimatorPauseListener(Animator.AnimatorPauseListener listener) {
+    lottieDrawable.addAnimatorPauseListener(listener);
+  }
+
+  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+  public void removeAnimatorPauseListener(Animator.AnimatorPauseListener listener) {
+    lottieDrawable.removeAnimatorPauseListener(listener);
+  }
+
   /**
    * @see #setRepeatCount(int)
    */
diff --git a/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java b/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
index e171b4b..ee145cc 100644
--- a/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
+++ b/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
@@ -44,6 +44,7 @@
 import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 
 /**
  * This can be used to show an lottie animation in any place that would normally take a drawable.
@@ -742,6 +743,12 @@
     animator.removeAllListeners();
   }
 
+  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+  public void addAnimatorPauseListener(Animator.AnimatorPauseListener listener) { animator.addPauseListener(listener); }
+
+  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
+  public void removeAnimatorPauseListener(Animator.AnimatorPauseListener listener) { animator.removePauseListener(listener); }
+
   /**
    * Sets the progress to the specified frame.
    * If the composition isn't set yet, the progress will be set to the frame when