Add inclusion list bits handling to block production

[conache]

Issue Addressed

Part of the FOCIL implementation. This PR adds the inclusion_list_bits handling to block production:

• the local bid sets its bits from the inclusion lists the node has stored for the previous slot (per builder spec)
• external bids whose bits are not inclusive of those inclusion lists are skipped in bid selection (per validator spec)

Proposed Changes

• In the bid selection logic, skip external bids whose inclusion_list_bits don't cover the node's inclusion list bits view. Direct builder bids are checked in verify_direct_bid. The cached bids received on gossip are re-checked at block production, since gossip verification only considered the timely inclusion lists at the time the bid arrived.
• In the local bid creation logic, set the bid's inclusion_list_bits from the node's inclusion list bits view
• The node's inclusion list bits view is read once when producing a block and shared by both flows, considering both timely and untimely inclusion lists (only_timely=False in the spec). If it can't be read the bits are empty: the local bid claims no inclusion lists and external bids aren't held to any

Additional Info

• The inclusivity check lives in a shared verify_bid_inclusion_list_bits helper, next to the other checks the gossip and direct verifiers share. sigp#10263 uses the same helper on the gossip layer. Both PRs add this helper, so whichever merges first carries it, and the other rebases on it

[conache]

Closing in favor of sigp#10266