feat(dns): add DNS server with configurable port and IP via CLI

src/dns/dns_cli.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "cli_base.hpp"
+#include <string>
+
+class DnsCli : public CliBase
+{
+  public:
+    DnsCli();
+
+    int getPort() const;
+    std::string getIp() const;
+
+  protected:
+    void setupOptions() override;
+
+  private:
+    int port_;
+    std::string ip_;
+};