refactor: enhance configuration handling and error checking for template fields in the Word output plugin

src/types/kintone.d.ts

@@ -98,4 +98,20 @@ declare namespace kintone {
     function getFormFields(): Promise<unknown>;
     function getFormLayout(): Promise<unknown>;
   }
+
+  function proxy(
+    url: string,
+    method: string,
+    headers: Record<string, string>,
+    data: Record<string, unknown> | string,
+  ): Promise<[string, number, Record<string, string>]>;
+
+  function proxy(
+    url: string,
+    method: string,
+    headers: Record<string, string>,
+    data: Record<string, unknown> | string,
+    callback: (resp: [string, number, Record<string, string>]) => void,
+    errback: (err: Error) => void,
+  ): void;
 }