feature(onchain_config): align with new contract ABIs from gravity_chain_core_contracts

[ByteYue]

BREAKING CHANGE: OrderedBlock API changed

- Replace blockPrologue/blockPrologueExt with onBlockStart from Blocker.sol
  - proposer: Option<[u8; 32]> -> proposer_index: Option<u64>
  - Remove enable_randomness parameter
- Update ValidatorSet fetcher to use getActiveValidators() instead of getValidatorSet()
- Replace ValidatorInfo/ValidatorSet with ValidatorConsensusInfo struct
- Replace AllValidatorsUpdated event with NewEpochEvent from Reconfiguration.sol
- Update contract addresses to match SystemAddresses.sol:
  - CONSENSUS_CONFIG_ADDR (0x1625f1007)
  - VALIDATOR_MANAGER_ADDR (0x1625f2001)
- Remove legacy backward-compatibility code

[github-actions]

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