refactor(v2): init events (#7823)

creates events structures for initial projections and read models

internal/v2/org/changed.go

@@ -0,0 +1,37 @@
+package org
+
+import (
+	"github.com/zitadel/zitadel/internal/v2/eventstore"
+	"github.com/zitadel/zitadel/internal/zerrors"
+)
+
+const ChangedType = eventTypePrefix + "changed"
+
+type changedPayload struct {
+	Name string `json:"name"`
+}
+
+type ChangedEvent eventstore.Event[changedPayload]
+
+var _ eventstore.TypeChecker = (*ChangedEvent)(nil)
+
+// ActionType implements eventstore.Typer.
+func (c *ChangedEvent) ActionType() string {
+	return ChangedType
+}
+
+func ChangedEventFromStorage(event *eventstore.StorageEvent) (e *ChangedEvent, _ error) {
+	if event.Type != e.ActionType() {
+		return nil, zerrors.ThrowInvalidArgument(nil, "ORG-pzOfP", "Errors.Invalid.Event.Type")
+	}
+
+	payload, err := eventstore.UnmarshalPayload[changedPayload](event.Payload)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ChangedEvent{
+		StorageEvent: event,
+		Payload:      payload,
+	}, nil
+}