perf: 从域名的soa获取主域名，子域名托管无需额外配置

packages/core/acme-client/src/index.js

@@ -46,3 +46,5 @@ export *  from './axios.js'
 export * from './logger.js'
 export * from './verify.js'
 export * from './error.js'
+
+export * from './util.js'

packages/core/acme-client/src/util.js

@@ -340,5 +340,6 @@ export {
     formatResponseError,
     getAuthoritativeDnsResolver,
     retrieveTlsAlpnCertificate,
+    resolveDomainBySoaRecord
 };