feat: User metadata (#2025)

* feat: user meta data events

* feat: user meta data set tests

* feat: user meta data tests

* feat: user meta data in protos

* feat: user meta data command api

* feat: user meta data query side

* feat: proto correct order, fix handlers

* feat: proto correct order

* feat: fixes of pr comments

* feat: fixes of pr comments

* feat: value as byte array

* feat: metadata feature

* Update internal/auth/repository/eventsourcing/handler/meta_data.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* Update internal/command/user_meta_data.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* Update proto/zitadel/metadata.proto

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* Update proto/zitadel/metadata.proto

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* fix: rename metadata files and table

* fix: rename meta data to metadat in protos

* Update internal/domain/metadata.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* fix: rename vars

* fix: rebiuld docs

* Update internal/iam/repository/view/metadata_view.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

Co-authored-by: Silvan <silvan.reusser@gmail.com>

internal/command/metadata_model.go

@@ -0,0 +1,49 @@
+package command
+
+import (
+	"github.com/caos/zitadel/internal/domain"
+	"github.com/caos/zitadel/internal/eventstore"
+	"github.com/caos/zitadel/internal/repository/metadata"
+)
+
+type MetadataWriteModel struct {
+	eventstore.WriteModel
+
+	Key   string
+	Value []byte
+	State domain.MetadataState
+}
+
+func (wm *MetadataWriteModel) Reduce() error {
+	for _, event := range wm.Events {
+		switch e := event.(type) {
+		case *metadata.SetEvent:
+			if wm.Key != e.Key {
+				continue
+			}
+			wm.Value = e.Value
+			wm.State = domain.MetadataStateActive
+		case *metadata.RemovedEvent:
+			wm.State = domain.MetadataStateRemoved
+		}
+	}
+	return wm.WriteModel.Reduce()
+}
+
+type MetadataListWriteModel struct {
+	eventstore.WriteModel
+
+	metadataList map[string][]byte
+}
+
+func (wm *MetadataListWriteModel) Reduce() error {
+	for _, event := range wm.Events {
+		switch e := event.(type) {
+		case *metadata.SetEvent:
+			wm.metadataList[e.Key] = e.Value
+		case *metadata.RemovedEvent:
+			delete(wm.metadataList, e.Key)
+		}
+	}
+	return wm.WriteModel.Reduce()
+}