refactor(storage-core): move storage files out of @bitwarden/common (#15076)

* refactor(platform): generate @bitwarden/storage-core boilerplate

* refactor(storage-core): move storage files out of @bitwarden/common

* chore(naming): rename AbstractStorageService to StorageService

libs/storage-core/src/storage-service.provider.ts

@@ -0,0 +1,39 @@
+import { ClientLocations } from "./client-locations";
+import { StorageLocation } from "./storage-location";
+import { StorageService, ObservableStorageService } from "./storage.service";
+
+export type PossibleLocation = StorageLocation | ClientLocations[keyof ClientLocations];
+
+/**
+ * A provider for getting client specific computed storage locations and services.
+ */
+export class StorageServiceProvider {
+  constructor(
+    protected readonly diskStorageService: StorageService & ObservableStorageService,
+    protected readonly memoryStorageService: StorageService & ObservableStorageService,
+  ) {}
+
+  /**
+   * Computes the location and corresponding service for a given client.
+   *
+   * **NOTE** The default implementation does not respect client overrides and if clients
+   * have special overrides they are responsible for implementing this service.
+   * @param defaultLocation The default location to use if no client specific override is preferred.
+   * @param overrides Client specific overrides
+   * @returns The computed storage location and corresponding storage service to use to get/store state.
+   * @throws If there is no configured storage service for the given inputs.
+   */
+  get(
+    defaultLocation: PossibleLocation,
+    overrides: Partial<ClientLocations>,
+  ): [location: PossibleLocation, service: StorageService & ObservableStorageService] {
+    switch (defaultLocation) {
+      case "disk":
+        return [defaultLocation, this.diskStorageService];
+      case "memory":
+        return [defaultLocation, this.memoryStorageService];
+      default:
+        throw new Error(`Unexpected location: ${defaultLocation}`);
+    }
+  }
+}