fix: move v2 pkgs (#1331)

* fix: move eventstore pkgs

* fix: move eventstore pkgs

* fix: remove v2 view

* fix: remove v2 view

internal/eventstore/event.go

@@ -0,0 +1,39 @@
+package eventstore
+
+import (
+	"time"
+)
+
+type EventPusher interface {
+	//Aggregate is the metadata of an aggregate
+	Aggregate() Aggregate
+	// EditorService is the service who wants to push the event
+	EditorService() string
+	//EditorUser is the user who wants to push the event
+	EditorUser() string
+	//KeyType must return an event type which should be unique in the aggregate
+	Type() EventType
+	//Data returns the payload of the event. It represent the changed fields by the event
+	// valid types are:
+	// * nil (no payload),
+	// * json byte array
+	// * struct which can be marshalled to json
+	// * pointer to struct which can be marshalled to json
+	Data() interface{}
+	//UniqueConstraints should be added for unique attributes of an event, if nil constraints will not be checked
+	UniqueConstraints() []*EventUniqueConstraint
+}
+
+type EventReader interface {
+	// EditorService is the service who pushed the event
+	EditorService() string
+	//EditorUser is the user who pushed the event
+	EditorUser() string
+	//KeyType is the type of the event
+	Type() EventType
+
+	Aggregate() Aggregate
+
+	Sequence() uint64
+	CreationDate() time.Time
+}