Auth: Add SignedIn user interface NamespacedID (#72944)

* wip

* scope active user to 1 org

* remove TODOs

* add render auth namespace

* import cycle fix

* make condition more readable

* convert Evaluate to user Requester

* only use active OrgID for SearchUserPermissions

* add cache key to interface definition

* change final SignedInUsers to interface

* fix api key managed roles fetch

* fix anon auth id parsing

* Update pkg/services/accesscontrol/acimpl/accesscontrol.go

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

---------

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/services/auth/identity/requester.go

@@ -1,9 +1,26 @@
 package identity
 
+import "github.com/grafana/grafana/pkg/models/roletype"
+
+const (
+	NamespaceUser           = "user"
+	NamespaceAPIKey         = "api-key"
+	NamespaceServiceAccount = "service-account"
+	NamespaceAnonymous      = "anonymous"
+	NamespaceRenderService  = "render"
+)
+
 type Requester interface {
 	GetIsGrafanaAdmin() bool
 	GetLogin() string
 	GetOrgID() int64
-	GetPermissions(orgID int64) map[string][]string
+	GetPermissions() map[string][]string
+	GetTeams() []int64
+	GetOrgRole() roletype.RoleType
+	GetNamespacedID() (string, string)
 	IsNil() bool
+
+	// Legacy
+	GetCacheKey() (string, error)
+	HasUniqueId() bool
 }