made every send have assoceated preimages

api/client.go

auth/callback.go

auth/confirm.go

auth/request.go

auth/verify.go

dummy/send.go

groupChat/makeGroup.go

groupChat/manager.go

interfaces/preimage/generate.go

interfaces/preimage/request.go

interfaces/preimage/types.go

keyExchange/rekey.go

keyExchange/trigger.go

network/message/sendE2E.go

storage/e2e/manager.go

storage/edge/edge_test.go

storage/edge/preimage.go

storage/edge/preimage_test.go