Implement Deposit Requests

[anvacaru]

Implementing Execution Layer Requests EIP-7685 and Deposit Requests EIP-6110.

Needs to be rebased to master after #2747 gets merged.

KEVM Implementation for EIPs 7685/6110

Configuration & Structure Changes

• Add requests.md file with execution layer request implementation

• Add configuration cells:

  • <requestsRoot> in block header
  • <requests> and <depositRequests> in network section

• Add execution flow logic:

  • #filterLogs function to process transaction logs. After all transactions in a block have finished executing, rules for #filterLogs will parse each log item to look for various requests (only Deposit implemented so far).
  • Add a log filtering call to block finalization

• #parseDepositRequest: Validates and extracts deposit requests by filtering logs from the deposit contract with the correct event signature

• #extractDepositData: Extracts the five deposit fields (pubkey, withdrawal_credentials, amount, signature, index) from raw log data according to EIP-6110 field offsets

• #isValidDepositEventData: Validates deposit log structure by checking data length (576 bytes) and verifying all expected field offsets and sizes

• #computeRequestsHash: Calculates the final 32-byte commitment hash that goes into the block header by processing all non-empty requests

• #computeRequestsHashIntermediate: Builds the intermediate hash list by skipping empty requests, hashing valid requests, and concatenating results in request-type order

• Add protocol features:

  • Ghasrequests flag (activated in Prague)
  • EVMC_INVALID_BLOCK status code

• Update block hash calculations:

  • Add request hash to block header hash
  • Update RLP serialization

• Update state management:

  • Initialize request fields in clearBLOCK
  • Handle request fields in RLP loading

• Updated K proof files