snap - diagnostic logging for malformed RLP messages

[macfarla]

PR description

extra logging (at DEBUG) to include message code when incoming RLP is malformed

Fixed Issue(s)

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• Considered documentation and added the doc-change-required label to this PR if updates are required.
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• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

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• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests
• hive tests: Engine or other RPCs modified?

[Copilot]

Pull request overview

Adds more diagnostic context to DEBUG logs when malformed RLP is received, specifically including the message code to aid troubleshooting before disconnecting peers.

Changes:

• Include message code alongside message data in malformed-RLP DEBUG logs for Snap and Eth request/response paths
• Switch EthProtocolManager malformed-RLP logging to use a throwable cause (setCause(e)) for stack traces

Reviewed changes

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

File	Description
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/manager/snap/SnapProtocolManager.java	Adds message code to malformed RLP debug log before disconnect
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/manager/RequestManager.java	Adds message code to malformed RLP debug log for responses
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/manager/EthProtocolManager.java	Logs message code + data and attaches exception cause in debug logging

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