feat(server): added keystore and made server cfg fetch from keystore to avoid db calls

backend/e2e-test/mocks/keystore.ts

@@ -0,0 +1,19 @@
+import { TKeyStoreFactory } from "@app/keystore/keystore";
+
+export const mockKeyStore = (): TKeyStoreFactory => {
+  const store: Record<string, string | number | Buffer> = {};
+
+  return {
+    setItem: async (key, value) => {
+      store[key] = value;
+      return "OK";
+    },
+    getItem: async (key) => {
+      const value = store[key];
+      if (typeof value === "string") {
+        return value;
+      }
+      return null;
+    }
+  };
+};