Auth: Refactor auth package (#58920)

* Auth: move interface to its own file

* Auth: move to test package

* Auth: move quota consts to auth file

* Auth: move service to impl package

* Auth: move interfaces and related models to auth package

* Auth: Create sub package and type alias to avoid circular dependency

pkg/api/common_test.go

@@ -28,7 +28,7 @@ import (
 	accesscontrolmock "github.com/grafana/grafana/pkg/services/accesscontrol/mock"
 	"github.com/grafana/grafana/pkg/services/accesscontrol/ossaccesscontrol"
 	"github.com/grafana/grafana/pkg/services/annotations/annotationstest"
-	"github.com/grafana/grafana/pkg/services/auth"
+	"github.com/grafana/grafana/pkg/services/auth/authtest"
 	"github.com/grafana/grafana/pkg/services/contexthandler"
 	"github.com/grafana/grafana/pkg/services/contexthandler/authproxy"
 	"github.com/grafana/grafana/pkg/services/contexthandler/ctxkey"
@@ -181,7 +181,7 @@ type scenarioContext struct {
 	defaultHandler          web.Handler
 	req                     *http.Request
 	url                     string
-	userAuthTokenService    *auth.FakeUserAuthTokenService
+	userAuthTokenService    *authtest.FakeUserAuthTokenService
 	sqlStore                sqlstore.Store
 	authInfoService         *logintest.AuthInfoServiceFake
 	dashboardVersionService dashver.Service
@@ -207,7 +207,7 @@ func getContextHandler(t *testing.T, cfg *setting.Cfg) *contexthandler.ContextHa
 	cfg.RemoteCacheOptions = &setting.RemoteCacheOptions{
 		Name: "database",
 	}
-	userAuthTokenSvc := auth.NewFakeUserAuthTokenService()
+	userAuthTokenSvc := authtest.NewFakeUserAuthTokenService()
 	renderSvc := &fakeRenderService{}
 	authJWTSvc := models.NewFakeJWTService()
 	tracer := tracing.InitializeTracerForTest()