fieldalignment of all structs to save memory

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

flow/flow.go

@@ -1,7 +1,17 @@
-// Package flow is an interface used for saga pattern messaging
+// Package flow is an interface used for saga pattern microservice workflow
 package flow
 
 type Step interface {
-	// Endpoint returns service_name.service_method
+	// Endpoint returns rpc endpoint service_name.service_method or broker topic
 	Endpoint() string
 }
+
+type Workflow interface {
+	Steps() [][]Step
+	Stop() error
+}
+
+type Flow interface {
+	Start(Workflow) error
+	Stop(Workflow)
+}