Introduce plusElement and minusElement to disambiguate situations like List<List<T>> + List<T>

#KT-9992 Fixed

libraries/stdlib/src/generated/_Arrays.kt

@@ -12358,6 +12358,14 @@ public operator fun ShortArray.plus(elements: ShortArray): ShortArray {
     return result
 }
 
+/**
+ * Returns an array containing all elements of the original array and then the given [element].
+ */
+@kotlin.jvm.JvmVersion
+public fun <T> Array<T>.plusElement(element: T): Array<T> {
+    return plus(element)
+}
+
 /**
  * Sorts the array in-place.
  */