Initial cache migration to new layers system (#11878)

* Initial cache migration to new layers system

* Fixing wrong change

* Remove unneeded constants

* Remove unneeded file

* Adding license headers

app/server_app_adapters.go

@@ -13,6 +13,7 @@ import (
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/services/mailservice"
 	"github.com/mattermost/mattermost-server/store"
+	"github.com/mattermost/mattermost-server/store/localcachelayer"
 	"github.com/mattermost/mattermost-server/store/sqlstore"
 	"github.com/mattermost/mattermost-server/utils"
 	"github.com/pkg/errors"
@@ -61,7 +62,7 @@ func (s *Server) RunOldAppInitalization() error {
 
 	if s.FakeApp().Srv.newStore == nil {
 		s.FakeApp().Srv.newStore = func() store.Store {
-			return store.NewTimerLayer(store.NewLayeredStore(sqlstore.NewSqlSupplier(s.FakeApp().Config().SqlSettings, s.Metrics), s.Metrics, s.Cluster), s.Metrics)
+			return store.NewTimerLayer(localcachelayer.NewLocalCacheLayer(store.NewLayeredStore(sqlstore.NewSqlSupplier(s.FakeApp().Config().SqlSettings, s.Metrics), s.Metrics, s.Cluster), s.Metrics, s.Cluster), s.Metrics)
 		}
 	}