PLT-5308 Caching layer part 2 (#6973)

* Adding Reaction store cache layer example

* Implementing reaction store in new caching system.

* Redis for reaction store

* Adding redis library

* Adding invalidation for DeleteAllWithEmojiName and other minor enhancements

store/layered_store_hints.go

@@ -9,3 +9,23 @@ const (
 	LSH_NO_CACHE LayeredStoreHint = iota
 	LSH_MASTER_ONLY
 )
+
+func hintsContains(hints []LayeredStoreHint, contains LayeredStoreHint) bool {
+	for _, hint := range hints {
+		if hint == contains {
+			return true
+		}
+	}
+	return false
+}
+
+func hintsContainsAny(hints []LayeredStoreHint, contains ...LayeredStoreHint) bool {
+	for _, hint := range hints {
+		for _, hint2 := range contains {
+			if hint == hint2 {
+				return true
+			}
+		}
+	}
+	return false
+}