feat(Kotlin): Replace value with _val (#1254)

* ci(kotlin): Add workflow file.

* Update kotlin.yml

* style(kotlin): value -> _val

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/kotlin/utils/ListNode.kt

@@ -7,7 +7,7 @@
 package utils
 
 /* 链表节点 */
-class ListNode(var value: Int) {
+class ListNode(var _val: Int) {
     var next: ListNode? = null
 
     companion object {
@@ -15,8 +15,8 @@ class ListNode(var value: Int) {
         fun arrToLinkedList(arr: IntArray): ListNode? {
             val dum = ListNode(0)
             var head = dum
-            for (value in arr) {
-                head.next = ListNode(value)
+            for (_val in arr) {
+                head.next = ListNode(_val)
                 head = head.next!!
             }
             return dum.next