updated add and delete items implementation according to release v2

Author: harshithad0703

lib/stack/release/items/index.js

@@ -52,25 +52,36 @@ export function ReleaseItem (http, data = {}) {
      * client.stack({ api_key: 'api_key'}).release('release_uid').delete({items})
      * .then((response) => console.log(response.notice))
      */
-    this.delete = async (items) => {
+    this.delete = async (params) => {
       let param = {}
-      if (items === undefined) {
+      if (params.items === undefined && params.item === undefined) {
         param = {all: true}
+        params.items = []
       }
       try {
         const headers = {
           headers: { ...cloneDeep(this.stackHeaders) },
           data: {
-            ...cloneDeep(items)
+            ...cloneDeep(params)
           },
           params: {
             ...cloneDeep(param)
           }
         } || {}
+        
+        if (params.release_version) {
+          headers.headers['release_version'] = params.release_version;
+        }
+        
+        if (params.item) {
+          this.urlPath = `releases/${data.releaseUid}/item`
+          headers.data['item'] = params.item
+        } else
+        headers.data['items'] = params.items
 
         const response = await http.delete(this.urlPath, headers)
         if (response.data) {
-          return new Release(http, { ...response.data, stackHeaders: data.stackHeaders })
+          return response.data
         } else {
           throw error(response)
         }
@@ -129,9 +140,18 @@ export function ReleaseItem (http, data = {}) {
           ...cloneDeep(this.stackHeaders)
         }
       } || {}
+      
+      if (param.release_version) { 
+        headers.headers['release_version'] = param.release_version;
+      }
+      if (param.item) {
+        this.urlPath = `releases/${data.releaseUid}/item`
+        param['item'] = param.item
+      } else
+        param['items'] = param.items
 
       try {
-        const response = await http.post(param.item ? `releases/${data.releaseUid}/item` : this.urlPath, param, headers)
+        const response = await http.post(this.urlPath, param, headers)
         if (response.data) {
           if (response.data) {
             return new Release(http, { ...response.data, stackHeaders: data.stackHeaders })
@@ -181,6 +201,25 @@ export function ReleaseItem (http, data = {}) {
       }
     }
 
+    /**
+     * The move request allows you to move multiple items within a release.
+     * @memberof ReleaseItem
+     * @func move
+     * @returns {Promise<Object>} Response Object.
+     * @param {Object} params.param - The data containing the items to be moved within the release.
+     * @param {String} [params.release_version] - The release version.
+     * @example
+     * const moveData = {
+     *   items: [
+     *     {
+     *       uid: '{{entry_uid}}',
+     *       content_type: '{{content_type_uid}}'
+     *     }
+     *   ]
+     * }
+     * client.stack({ api_key: 'api_key'}).release('release_uid').item().move({ param: moveData, release_version: '1.0' })
+     * .then((response) => { console.log(response) })
+     */
     this.move = async ({ param, release_version = '' }) => {
       const headers = {
         headers: {