feat: enhance the demo with netstat and dns_query telemetries

[Kevin222004]

part of #5

feat: enhance the demo with netstat and dns_query telemetries

https://github.com/influxdata/telegraf/tree/master/plugins/inputs/dns_query

https://github.com/influxdata/telegraf/tree/master/plugins/inputs/netstat

[glimchb]

I see in log:

+ curl --fail 'http://127.0.0.1:9091/api/v1/query?query=netstat_tcp_listen'
+ grep netstat_tcp_listen
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   235  100   235    0     0   213k      0 --:--:-- --:--:-- --:--:--  229k
{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"netstat_tcp_listen","host":"303715bc086a","instance":"otel-gw-collector:8889","job":"otel-collector","label1":"value1"},"value":[1719503364.674,"1"]}]}}

and

+ curl --fail 'http://127.0.0.1:9091/api/v1/query?query=dns_query_result_code'
+ grep dns_query_result_code
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   326  100   326    0     0   283k      0 --:--:-- --:--:-- --:--:--  318k
{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"dns_query_result_code","domain":".","host":"303715bc086a","instance":"otel-gw-collector:8889","job":"otel-collector","label1":"value1","rcode":"NOERROR","record_type":"NS","result":"success","server":"8.8.8.8"},"value":[1719503364.682,"0"]}]}}