refactor(v2): init events (#7823)

creates events structures for initial projections and read models

internal/v2/user/domain_claimed.go

@@ -0,0 +1,38 @@
+package user
+
+import (
+	"github.com/zitadel/zitadel/internal/v2/eventstore"
+	"github.com/zitadel/zitadel/internal/zerrors"
+)
+
+type domainClaimedPayload struct {
+	Username          string `json:"userName"`
+	TriggeredAtOrigin string `json:"triggerOrigin,omitempty"`
+}
+
+type DomainClaimedEvent eventstore.Event[domainClaimedPayload]
+
+const DomainClaimedType = AggregateType + ".domain.claimed.sent"
+
+var _ eventstore.TypeChecker = (*DomainClaimedEvent)(nil)
+
+// ActionType implements eventstore.Typer.
+func (c *DomainClaimedEvent) ActionType() string {
+	return DomainClaimedType
+}
+
+func DomainClaimedEventFromStorage(event *eventstore.StorageEvent) (e *DomainClaimedEvent, _ error) {
+	if event.Type != e.ActionType() {
+		return nil, zerrors.ThrowInvalidArgument(nil, "USER-x8O4o", "Errors.Invalid.Event.Type")
+	}
+
+	payload, err := eventstore.UnmarshalPayload[domainClaimedPayload](event.Payload)
+	if err != nil {
+		return nil, err
+	}
+
+	return &DomainClaimedEvent{
+		StorageEvent: event,
+		Payload:      payload,
+	}, nil
+}