Add NetworkDnsServerSupportReported in stats.proto

  // The sampling-rate of this event is 1/sampling_rate_denom.

  optional int32 sampling_rate_denom = 15;

}

/**

 * logs the number of DNS servers supported by the protocol

 */

message NetworkDnsServerSupportReported {

    // The network type of the network

    optional NetworkType network_type = 1;

    // The private DNS mode of the network

    optional PrivateDnsModes private_dns_modes = 2;

    // Stores the state of all DNS servers for this network

    optional Servers servers = 3;

}

message Servers {

    repeated Server server = 1;

}

message Server {

    optional Protocol protocol = 1;

    // The order of the dns server in the network

    optional int32 index = 2;

    // The validation status of the DNS server in the network

    required bool validated = 3;

}