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

apps/browser/config/config.js

@@ -0,0 +1,30 @@
+function load(envName) {
+  return {
+    ...loadConfig(envName),
+    ...loadConfig("local"),
+  };
+}
+
+function log(configObj) {
+  const repeatNum = 50;
+  console.log(`${"=".repeat(repeatNum)}\nenvConfig`);
+  console.log(JSON.stringify(configObj, null, 2));
+  console.log(`${"=".repeat(repeatNum)}`);
+}
+
+function loadConfig(configName) {
+  try {
+    return require(`./${configName}.json`);
+  } catch (e) {
+    if (e instanceof Error && e.code === "MODULE_NOT_FOUND") {
+      return {};
+    } else {
+      throw e;
+    }
+  }
+}
+
+module.exports = {
+  load,
+  log,
+};