Add SparseArray#set for Kotlin index= operator

Just an alias for put to allow `array[index] = value` syntax in Kotlin.

Bug: 163565712

Test: manual, used in tests for separate feature

Change-Id: Ie9e17b8f4d16a52f4dc213e1ada8d61fce9eedaf

core/api/current.txt

@@ -45372,6 +45372,7 @@ package android.util {
     method public void remove(int);
     method public void removeAt(int);
     method public void removeAtRange(int, int);
+    method public void set(int, E);
     method public void setValueAt(int, E);
     method public int size();
     method public E valueAt(int);

core/java/android/util/SparseArray.java

@@ -240,6 +240,14 @@ public class SparseArray<E> implements Cloneable {
         // Log.e("SparseArray", "gc end with " + mSize);
     }
 
+    /**
+     * Alias for {@link #put(int, Object)} to support Kotlin [index]= operator.
+     * @see #put(int, Object)
+     */
+    public void set(int key, E value) {
+        put(key, value);
+    }
+
     /**
      * Adds a mapping from the specified key to the specified value,
      * replacing the previous mapping from the specified key if there