Generate extensions for unsigned arrays and provide tests for them

- contentEquals, contentToString, contentHashCode
- as[Signed]Array, as[Unsigned]Array
- to[Signed]Array, to[Unsigned]Array
- toTypedArray
- copyOf(), copyOf(newSize), copyOfRange(...)

libraries/stdlib/js/src/generated/_ArraysJs.kt

@@ -1126,6 +1126,6 @@ public actual fun BooleanArray.toTypedArray(): Array<Boolean> {
  * Returns a *typed* object array containing all of the elements of this primitive array.
  */
 public actual fun CharArray.toTypedArray(): Array<Char> {
-    return Array<Char>(size, { i -> this[i] })
+    return Array(size) { index -> this[index] }
 }