refactor: optimize TCP and UDP checksum handling with eBPF

[tzssangglass]

udp and tcp ingress:

1. use bpf_l4_csum_replace bpf_l3_csum_replace to recalculate the checksums;
2. and bpf_skb_store_bytes to update dest ip and port;

Signed-off-by: tzssangglass [email protected]

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[tzssangglass]

ok, I will update based on the comments.

[shaneutt]

@tzssangglass needs a rebase on main

@astoycos when you're done with your review, if you'd like me to take a pass as well please do ping me

[tzssangglass]

needs a rebase on main

done

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astoycos, tzssangglass

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[tzssangglass]

oops, it looks like k8s-ci-robot didn't squash the commit.