AuthN: Add client to perform basic authentication (#60877)

* AuthN: Add basic auth client boilerplate

* AuthN: Implement test function for basic auth client

* AuthN: Implement the authentication method for basic auth

* AuthN: Add tests for basic auth authentication

* ContextHandler: perform basic auth authentication through authn service
if feature toggle is enabled

* AuthN: Add providers for sync services and pass required dependencies

pkg/services/authn/authnimpl/usersync/orgsync.go

@@ -15,6 +15,10 @@ import (
 	"github.com/grafana/grafana/pkg/services/user"
 )
 
+func ProvideOrgSync(userService user.Service, orgService org.Service, accessControl accesscontrol.Service) *OrgSync {
+	return &OrgSync{userService, orgService, accessControl, log.New("org.sync")}
+}
+
 type OrgSync struct {
 	userService   user.Service
 	orgService    org.Service