Feat: Remove error package in favor of stdlib's (#146)

client/lib.go

go.mod

packages/autopeering/discover/protocol.go

packages/autopeering/peer/peer.go

packages/autopeering/selection/protocol.go

packages/autopeering/server/errors.go

packages/autopeering/server/server.go

packages/database/badger_instance.go

packages/datastructure/doubly_linked_list.go

packages/datastructure/errors.go

packages/errors/errors.go

packages/errors/stack.go

packages/gossip/errors.go

packages/gossip/manager.go

packages/gossip/server/server.go

packages/model/approvers/approvers.go

packages/model/approvers/errors.go

packages/model/bundle/bundle.go

packages/model/bundle/errors.go

packages/model/error.go