feat: 域名验证方法支持CNAME间接方式，此方式支持所有域名注册商，且无需提供Access授权，但是需要手动添加cname解析

packages/ui/certd-server/src/modules/pipeline/service/cname-proxy-service.ts

@@ -0,0 +1,14 @@
+import { CnameRecord, ICnameProxyService } from '@certd/pipeline';
+
+export class CnameProxyService implements ICnameProxyService {
+  userId: number;
+  getter: <T>(domain: string, userId?: number) => Promise<T>;
+  constructor(userId: number, getter: (domain: string, userId: number) => Promise<any>) {
+    this.userId = userId;
+    this.getter = getter;
+  }
+
+  getByDomain(domain: string): Promise<CnameRecord> {
+    return this.getter<CnameRecord>(domain, this.userId);
+  }
+}