[Draft]adding drop bytes and drop packets count metric

[yash97]

Issue #, if available:

solves #229
Description of changes:
his PR enhances the network policy agent by adding packet length and direction information to policy events. These additions enable the export of more detailed metrics, specifically:

1. Packet drop counts with direction
2. Packet drop bytes with direction

Sample Output of metrics:

 curl localhost:61680/metrics

# HELP network_policy_drop_bytes_total Total number of bytes dropped by network policy agent
# TYPE network_policy_drop_bytes_total counter
network_policy_drop_bytes_total{direction="ingress"} 1.0665324e+07
# HELP network_policy_drop_count_total Total number of packets dropped by network policy agent
# TYPE network_policy_drop_count_total counter
network_policy_drop_count_total{direction="ingress"} 144126

Important Notes

These metrics will only be measured if the --enable-policy-event-logs flag is set to true.

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