feat(dynamic-exporter): Add dynamic flow exporter support for hubble

[anubhabMajumdar]

Description

Adding support for dynamic flow exporter in Hubble.
Read more about dynamic flow exporter here.

Checklist

• I have read the contributing documentation.
• I signed and signed-off the commits (git commit -S -s ...). See this documentation on signing commits.
• I have correctly attributed the author(s) of the code.
• I have tested the changes locally.
• I have followed the project's style guidelines.
• I have updated the documentation, if necessary.
• I have added tests, if applicable.

Screenshots (if applicable) or Testing Completed

$ kno aks-nodepool1-10725549-vmss000000
root@aks-nodepool1-10725549-vmss000000:/# tail -f /var/run/retina/hubble/events.log
...
{"flow":{"time":"2024-11-19T22:35:33.343220551Z","verdict":"FORWARDED","IP":{"source":"192.168.2.38","destination":"10.224.0.4","ipVersion":"IPv4"},"l4":{"TCP":{"source_port":46518,"destination_port":10250,"flags":{"ACK":true}}},"source":{"ID":31432,"identity":31432,"namespace":"kube-system","pod_name":"konnectivity-agent-7d494c7d79-7pm4z"},"destination":{"ID":1,"identity":1,"labels":["reserved:host"]},"Type":"L3_L4","event_type":{"type":4,"sub_type":3},"traffic_direction":"EGRESS","trace_observation_point":"TO_STACK","is_reply":false,"Summary":"TCP Flags: ACK:true","extensions":{"@type":"type.googleapis.com/utils.RetinaMetadata","bytes":66}},"time":"2024-11-19T22:35:33.343220551Z"}
{"flow":{"time":"2024-11-19T22:35:33.343337550Z","verdict":"FORWARDED","IP":{"source":"192.168.2.38","destination":"10.224.0.4","ipVersion":"IPv4"},"l4":{"TCP":{"source_port":46518,"destination_port":10250,"flags":{"ACK":true}}},"source":{"ID":31432,"identity":31432,"namespace":"kube-system","pod_name":"konnectivity-agent-7d494c7d79-7pm4z"},"destination":{"ID":1,"identity":1,"labels":["reserved:host"]},"Type":"L3_L4","event_type":{"type":4,"sub_type":3},"traffic_direction":"EGRESS","trace_observation_point":"TO_STACK","is_reply":false,"Summary":"TCP Flags: ACK:true","extensions":{"@type":"type.googleapis.com/utils.RetinaMetadata","bytes":66}},"time":"2024-11-19T22:35:33.343337550Z"}
root@aks-nodepool1-10725549-vmss000000:/# ls -la /var/run/retina/hubble
total 51480
drwxr-xr-x 2 root root      160 Nov 19 22:35 .
drwxr-xr-x 3 root root       60 Nov 19 01:53 ..
-rw-r--r-- 1 root root 10485267 Nov 19 16:32 events-2024-11-19T16-32-15.656.log
-rw-r--r-- 1 root root 10485050 Nov 19 16:49 events-2024-11-19T16-49-23.125.log
-rw-r--r-- 1 root root 10485079 Nov 19 17:06 events-2024-11-19T17-06-33.124.log
-rw-r--r-- 1 root root 10485306 Nov 19 17:23 events-2024-11-19T17-23-47.045.log
-rw-r--r-- 1 root root 10485271 Nov 19 22:35 events-2024-11-19T22-35-48.976.log
-rw-r--r-- 1 root root   284620 Nov 19 22:36 events.log
root@aks-nodepool1-10725549-vmss000000:/#

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Please refer to the CONTRIBUTING.md file for more information on how to contribute to this project.

[nddq]

some nit comments but lgtm otherwise