fix(client,testing,build): improve TypeScript compatibility for DNS client parsing and test suite

ts_client/classes.dnsclient.ts

@@ -248,10 +248,11 @@ export class Smartdns {
         return;
       }
       const returnArray: plugins.tsclass.network.IDnsRecord[] = [];
-      for (const recordKey in recordsArg) {
+      for (const record of recordsArg as unknown[]) {
+        const value = Array.isArray(record) ? record.join('') : String(record);
         returnArray.push({
           name: recordNameArg,
-          value: recordsArg[recordKey][0],
+          value,
           type: recordTypeArg,
           dnsSecEnabled: false,
         });
@@ -280,7 +281,7 @@ export class Smartdns {
 
   public convertDnsTypeNumberToTypeName(
     dnsTypeNumberArg: number
-  ): plugins.tsclass.network.TDnsRecordType {
+  ): plugins.tsclass.network.TDnsRecordType | null {
     for (const key in this.dnsTypeMap) {
       if (this.dnsTypeMap[key] === dnsTypeNumberArg) {
         return key as plugins.tsclass.network.TDnsRecordType;