fix: 回滚mutators.move行为 (#984)

* fix: rollback the behavior of mutators.move and add mutators.swap

* fix: issue fix

packages/core/src/externals.ts

@@ -1064,7 +1064,7 @@ export const createFormExternals = (
       shift() {
         return mutators.remove(0)
       },
-      move($from: number, $to: number) {
+      swap($from: number, $to: number) {
         const arr = toArr(getValue()).slice()
         const fromItem = arr[$from]
         const toItem = arr[$to]
@@ -1073,6 +1073,14 @@ export const createFormExternals = (
         setValue(arr)
         return arr
       },
+      move($from: number, $to: number) {
+        const arr = toArr(getValue()).slice()
+        const item = arr[$from]
+        arr.splice($from, 1)
+        arr.splice($to, 0, item)
+        setValue(arr)
+        return arr
+      },
       moveUp(index: number) {
         const len = toArr(getValue()).length
         return mutators.move(index, index - 1 < 0 ? len - 1 : index - 1)