Sync history conversation of the Chat (#3281)

* Sync historical message

* Add documentation

* Code simplify

* feat: add syncHistory method in Chat class

* docs: update docs

* chore: update examples

* fix: handle asynchronous function properly

* refactor: include await

---------

Co-authored-by: alechkos <93551621+alechkos@users.noreply.github.com>

src/structures/Chat.js

@@ -270,6 +270,14 @@ class Chat extends Base {
     async changeLabels(labelIds) {
         return this.client.addOrRemoveLabels(labelIds, [this.id._serialized]);
     }
+
+    /**
+     * Sync chat history conversation
+     * @return {Promise<boolean>} True if operation completed successfully, false otherwise.
+     */
+    async syncHistory() {
+        return this.client.syncHistory(this.id._serialized);
+    }
 }
 
 module.exports = Chat;