Chore: Start annotations app (#113018)

* annotation legacy store with api server, read only

* Add a feature flag for annotations app

* implement list filters

* annotations are not addressable by ID for read operations

* fix registry apps test

* add ownership for an app

* disable linter

* typo, of course

* fix go workspace

* update workspace

* copy annotation app in dockerfile

* update workspace

---------

Co-authored-by: Tania B. <10127682+undef1nd@users.noreply.github.com>

apps/annotation/pkg/app/app.go

@@ -0,0 +1,54 @@
+package app
+
+import (
+	"context"
+
+	"github.com/grafana/grafana-app-sdk/app"
+	"github.com/grafana/grafana-app-sdk/logging"
+	"github.com/grafana/grafana-app-sdk/operator"
+	"github.com/grafana/grafana-app-sdk/resource"
+	"github.com/grafana/grafana-app-sdk/simple"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	annotationv0alpha1 "github.com/grafana/grafana/apps/annotation/pkg/apis/annotation/v0alpha1"
+)
+
+func New(cfg app.Config) (app.App, error) {
+	simpleConfig := simple.AppConfig{
+		Name:       "annotation",
+		KubeConfig: cfg.KubeConfig,
+		InformerConfig: simple.AppInformerConfig{
+			InformerOptions: operator.InformerOptions{
+				ErrorHandler: func(ctx context.Context, err error) {
+					logging.FromContext(ctx).Error("Informer processing error", "error", err)
+				},
+			},
+		},
+		ManagedKinds: []simple.AppManagedKind{{
+			Kind: annotationv0alpha1.AnnotationKind(),
+		},
+		},
+	}
+
+	a, err := simple.NewApp(simpleConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	err = a.ValidateManifest(cfg.ManifestData)
+	if err != nil {
+		return nil, err
+	}
+
+	return a, nil
+}
+
+func GetKinds() map[schema.GroupVersion][]resource.Kind {
+	gv := schema.GroupVersion{
+		Group:   annotationv0alpha1.AnnotationKind().Group(),
+		Version: annotationv0alpha1.AnnotationKind().Version(),
+	}
+	return map[schema.GroupVersion][]resource.Kind{
+		gv: {annotationv0alpha1.AnnotationKind()},
+	}
+}