Authz: add support to use folder api to fetch folder tree (#100038)

* Add FolderStore interface

* Authz: add implementation to use folders api and use it inproc with loopback config

* Add tracing and add rest.Config for talking with folder api using access tokens

* Restructure test to get rid of circular dependencies in tests

* use correct group version kind

---------

Co-authored-by: gamab <gabriel.mabille@grafana.com>

pkg/services/authz/rbac/store/models.go

@@ -19,21 +19,3 @@ type UserIdentifierQuery struct {
 	UserID  int64
 	UserUID string
 }
-
-type FolderQuery struct {
-	OrgID int64
-}
-
-type DashboardQuery struct {
-	OrgID int64
-}
-
-type Folder struct {
-	UID       string
-	ParentUID *string
-}
-
-type Dashboard struct {
-	UID       string
-	ParentUID *string
-}