Authn: Anon session service (#63052)

* add anon sessions package

* add usage stat fn

* implement count for cache

* add anonservice to authn broker

* lint

* add tests for remote cache count

* move anon service to services

* wrap tagging in goroutine

* make func used

pkg/middleware/middleware_test.go

@@ -25,6 +25,7 @@ import (
 	"github.com/grafana/grafana/pkg/infra/remotecache"
 	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/login"
+	"github.com/grafana/grafana/pkg/services/anonymous/anontest"
 	"github.com/grafana/grafana/pkg/services/apikey"
 	"github.com/grafana/grafana/pkg/services/apikey/apikeytest"
 	"github.com/grafana/grafana/pkg/services/auth"
@@ -959,7 +960,7 @@ func getContextHandler(t *testing.T, cfg *setting.Cfg, mockSQLStore *dbtest.Fake
 		loginService, apiKeyService, authenticator, userService, orgService,
 		oauthTokenService,
 		featuremgmt.WithFeatures(featuremgmt.FlagAccessTokenExpirationCheck),
-		&authntest.FakeService{})
+		&authntest.FakeService{}, &anontest.FakeAnonymousSessionService{})
 }
 
 type fakeRenderService struct {