NETOBSERV-1061: Add TCP drop and DNS tracking hooks (#115)

* Add TCP drop hook and update flows metrics

Signed-off-by: msherif1234 <mmahmoud@redhat.com>

* update agent e2e manifest to mount kernel debug volume

Signed-off-by: msherif1234 <mmahmoud@redhat.com>

* Add light weight DNS tracker hook

Signed-off-by: msherif1234 <mmahmoud@redhat.com>

* rename tcpdrop fields to reflect its the latest drop
fix lint errors
flatten icmp block

Signed-off-by: msherif1234 <mmahmoud@redhat.com>

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Signed-off-by: msherif1234 <mmahmoud@redhat.com>