should_apply_proposer_boost equivocation

[tbenr]

the core functionality od should_apply_proposer_boost is the equivocation check

https://github.com/Consensys/teku/pull/10600/changes/BASE..9cb80574d88a168e61d7f0148c59597298fb1ac6#diff-6e0974b4b3a084bc44478373aee51ba5ca5dcae8e5ada5103010f60442f1f9a2R208-R216

it requires sharing information with gossip data structures to be able to detect equivocations.

the usecase is edgy and i don't know how many clients will ever implement this.