Fork choice: update the Store to handle ILs

[mehdi-aouadi]

Modified Store

Note: Store is modified to track the seen inclusion lists and inclusion list equivocators.

@dataclass
class Store(object):
    time: uint64
    genesis_time: uint64
    justified_checkpoint: Checkpoint
    finalized_checkpoint: Checkpoint
    unrealized_justified_checkpoint: Checkpoint
    unrealized_finalized_checkpoint: Checkpoint
    proposer_boost_root: Root
    equivocating_indices: Set[ValidatorIndex]
    blocks: Dict[Root, BeaconBlock] = field(default_factory=dict)
    block_states: Dict[Root, BeaconState] = field(default_factory=dict)
    block_timeliness: Dict[Root, boolean] = field(default_factory=dict)
    checkpoint_states: Dict[Checkpoint, BeaconState] = field(default_factory=dict)
    latest_messages: Dict[ValidatorIndex, LatestMessage] = field(default_factory=dict)
    unrealized_justifications: Dict[Root, Checkpoint] = field(default_factory=dict)
    # [New in EIP-7805]
    inclusion_lists: Dict[Tuple[Slot, Root], List[InclusionList]] = field(default_factory=dict)
    inclusion_list_equivocators: Dict[Tuple[Slot, Root], Set[ValidatorIndex]] = field(default_factory=dict)
    unsatisfied_inclusion_list_blocks: Set[Root] = field(default_factory=Set)