feat(p2p): add egress/ingress traffic metrics to discv5 udp transport #16369

[gzliudan]

Proposed changes

Ref: ethereum#16369

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

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• Consensus
• Account
• Network
• Geth
• Smart Contract
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
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[Copilot]

Pull request overview

Adds ingress/egress traffic metering for the discv5 UDP transport to improve network observability.

Changes:

• Register new discv5-specific inbound/outbound traffic meters.
• Mark outbound UDP bytes on successful sends.
• Mark inbound UDP bytes for received packets.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
p2p/discv5/udp.go	Adds byte-count metering on UDP send/receive paths.
p2p/discv5/metrics.go	Registers new discv5 inbound/outbound traffic meters.

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