[PM-6404] Initial Clear Events Code (#8029)

* Add New KeyDefinitionOption

* Add New Services

* Add WebStorageServiceProvider Tests

* Update Error Message

* Add `UserKeyDefinition`

* Fix Deserialization Helpers

* Fix KeyDefinition

* Add `UserKeyDefinition`

* Fix Deserialization Helpers

* Fix KeyDefinition

* Move `ClearEvent`

* Cleanup

* Fix Imports

* Remove `updateMock`

* Call Super in Web Implementation

* Use Better Type to Avoid Casting

* Better Error Docs

* Move StorageKey Creation to Function

* Throw Aggregated Error for Failures

libs/common/src/platform/services/storage-service.provider.ts

@@ -0,0 +1,39 @@
+import { AbstractStorageService, ObservableStorageService } from "../abstractions/storage.service";
+// eslint-disable-next-line import/no-restricted-paths
+import { ClientLocations, StorageLocation } from "../state/state-definition";
+
+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: AbstractStorageService & ObservableStorageService,
+    protected readonly memoryStorageService: AbstractStorageService & 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: AbstractStorageService & ObservableStorageService] {
+    switch (defaultLocation) {
+      case "disk":
+        return [defaultLocation, this.diskStorageService];
+      case "memory":
+        return [defaultLocation, this.memoryStorageService];
+      default:
+        throw new Error(`Unexpected location: ${defaultLocation}`);
+    }
+  }
+}