PS-1133 Feature/mv3 browser observable memory caching (#3245)

* Create sessions sync structure

* Add observing to session-syncer

* Do not run syncer logic in decorator tests

* Extract test constants

* Change Observables to BehaviorSubject

* Move sendMessage to static method in BrowserApi

* Implement session sync

* only watch in manifest v3

* Use session sync on folder service

* Add array observable sync

* Bypass cache on update from message

* Create feature and dev flags for browser

* Protect development-only methods with decorator

* Improve todo comments for long-term residency

* Use class properties in init

* Do not reuse mocks

* Use json (de)serialization patterns

* Fix failing session storage in dev environment

* Split up complex EncString constructor

* Default false for decrypted session storage

* Try removing hydrate EncString method

* PR review

* PR test review

libs/common/src/abstractions/storage.service.ts

@@ -6,3 +6,7 @@ export abstract class AbstractStorageService {
   abstract save<T>(key: string, obj: T, options?: StorageOptions): Promise<void>;
   abstract remove(key: string, options?: StorageOptions): Promise<void>;
 }
+
+export abstract class AbstractCachedStorageService extends AbstractStorageService {
+  abstract getBypassCache<T>(key: string, options?: StorageOptions): Promise<T>;
+}