[#45] morph: Pass actor providers instead actors themselves

* Make NewContractStorage and NewContractStorageWithSimpleActor
  recieve actor providers instead actors themselves
  because actors may be expired if websocket connection was broken.

Signed-off-by: Airat Arifullin <aarifullin@yadro.com>

pkg/morph/policy/policy_contract_storage.go

@@ -29,18 +29,28 @@ type ContractStorage struct {
 
 var _ engine.MorphRuleChainStorage = (*ContractStorage)(nil)
 
-func NewContractStorage(actor client.Actor, contract util.Uint160) *ContractStorage {
+type ActorProvider interface {
+	GetActor() client.Actor
+}
+
+func NewContractStorage(actorProvider ActorProvider, contract util.Uint160) *ContractStorage {
 	return &ContractStorage{
-		contractInterface: client.New(actor, contract),
+		contractInterface: client.New(actorProvider.GetActor(), contract),
 	}
 }
 
-func NewContractStorageWithSimpleActor(rpcActor actor.RPCActor, acc *wallet.Account, contract util.Uint160) (*ContractStorage, error) {
-	act, err := actor.NewSimple(rpcActor, acc)
+type RPCActorProvider interface {
+	GetRPCActor() actor.RPCActor
+}
+
+func NewContractStorageWithSimpleActor(rpcActorProvider RPCActorProvider, acc *wallet.Account, contract util.Uint160) (*ContractStorage, error) {
+	act, err := actor.NewSimple(rpcActorProvider.GetRPCActor(), acc)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create simple actor: %w", err)
 	}
-	return NewContractStorage(act, contract), nil
+	return &ContractStorage{
+		contractInterface: client.New(act, contract),
+	}, nil
 }
 
 func (s *ContractStorage) AddMorphRuleChain(name chain.Name, target engine.Target, c *chain.Chain) (txHash util.Uint256, vub uint32, err error) {