Feat: added society and elders + refactored some code

packages/unbreakable_consensus/consensus_test.go

packages/unbreakable_consensus/epoch.go

packages/unbreakable_consensus/epoch_register.go

...ages/unbreakable_consensus/social_consensus/elder_mask.go

packages/unbreakable_consensus/social_consensus/node.go

packages/unbreakable_consensus/social_consensus/society.go

packages/unbreakable_consensus/transaction.go