/eth/v1/beacon/states/{state_id}/finality_checkpoints
Returns finality checkpoints for state with given 'stateId'. In case finality is not yet achieved, checkpoint should return epoch 0 and ZERO_HASH as root.
Returns finality checkpoints for state with given 'stateId'. In case finality is not yet achieved, checkpoint should return epoch 0 and ZERO_HASH as root.