fix(forms): improve field error method type defs

Change `getFieldError` and `getFieldsError` to return actual types, instead of very restrictive `Object` type (which should be avoided in general, in favour of `unknown`, `object`, or `Record` depending on actual use).

components/form/Form.tsx

@@ -171,8 +171,8 @@ export type WrappedFormUtils<V = any> = {
   validateFieldsAndScroll(options: ValidateFieldsOptions): void;
   validateFieldsAndScroll(): void;
   /** 获取某个输入控件的 Error */
-  getFieldError(name: string): Object[];
-  getFieldsError(names?: Array<string>): Object;
+  getFieldError(name: string): string[] | undefined;
+  getFieldsError(names?: Array<string>): Record<string, string[] | undefined>;
   /** 判断一个输入控件是否在校验状态 */
   isFieldValidating(name: string): boolean;
   isFieldTouched(name: string): boolean;