implement and use striped LRU cache to lower mutex contention (#15764)

* Implement Striped LRU cache

* ci

* fix

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/apitestlib.go

@@ -102,7 +102,11 @@ func setupTestHelper(dbStore store.Store, searchEngine *searchengine.Broker, ent
 	if includeCache {
 		// Adds the cache layer to the test store
 		options = append(options, app.StoreOverride(func(s *app.Server) store.Store {
-			return localcachelayer.NewLocalCacheLayer(dbStore, s.Metrics, s.Cluster, s.CacheProvider)
+			lcl, err2 := localcachelayer.NewLocalCacheLayer(dbStore, s.Metrics, s.Cluster, s.CacheProvider)
+			if err2 != nil {
+				panic(err2)
+			}
+			return lcl
 		}))
 	} else {
 		options = append(options, app.StoreOverride(dbStore))