perf(votes): add attestation caching

[MatusKysel]

Description

In the original flamegraph (run before any caching), reth_bsc::node::evm::pre_execution::verify_vote_attestation accounted for 5.49 % of total samples and the BLST Signature::fast_aggregate_verify underneath it took another 5.32 %.

[will-2012]

SNAPSHOT_FINGERPRINT_CACHE / BLS_PUBKEY_CACHE: Are there memory issues if the instance runs for an extended period of time?

[Copilot]

Pull request overview

This PR adds caching to attestation verification to improve performance. According to the flamegraph analysis, verify_vote_attestation and the underlying BLST signature verification were consuming over 10% of total execution time. The changes introduce three new caches to avoid redundant cryptographic operations and validator set processing.

• Adds attestation verification result caching to skip expensive BLS signature verification for already-validated attestations
• Implements snapshot fingerprinting and BLS public key caching to reuse parsed cryptographic objects
• Refactors validator address derivation into a dedicated method to eliminate code duplication

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/node/evm/pre_execution.rs	Adds three new caches (attestation verification, snapshot fingerprint, BLS public keys) and integrates them into the attestation verification flow. Includes unit tests for cache behavior.
src/node/miner/config.rs	Refactors validator address derivation logic into the new derive_validator_address_from_keys() method and updates tests to use shared helper functions.
src/rpc/mev.rs	Simplifies MEV API initialization by removing inline key derivation logic and relying solely on the configured validator address.
src/main.rs	Adds explicit error handling for validator address derivation during mining configuration setup.

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