Injecting handshake relevant statistics into statsd.

|sampling_rate_denom| and |round_trips| are not handled in this change.

event_metrics {
  data {
    aggregated_atom_info {
      atom {
        network_dns_handshake_reported {
          protocol: PROTO_DOH
          result: HR_SUCCESS
          cause: HC_SERVER_PROBE
          network_type: NT_WIFI
          private_dns_mode: PDM_STRICT
          latency_micros: 42596
          bytes_sent: 761
          bytes_received: 6420
          round_trips: -1
          tls_session_cache_hit: false
          tls_version: 3
          hostname_verification: true
          quic_version: 1
          server_index: -1
          sampling_rate_denom: -1
        }
      }
      elapsed_timestamp_nanos: 195891466159
    }
  }
}

Bug: 249206898
Test: atest resolv_integration_test
Change-Id: I312b61e224722e6bc90e29a05bc2103ebbd6dd73