feat: add services package

packages/services/src/Domain/Event/EventObserver.ts

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+export type EventObserver<E, D> = (eventName: E, data?: D) => Promise<void> | void

packages/services/src/Domain/Event/SyncEvent.ts

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+/* istanbul ignore file */
+export enum SyncEvent {
+  /**
+   * A potentially multi-round trip that keeps syncing until all items have been uploaded.
+   * However, this event will still trigger if there are more items waiting to be downloaded on the
+   * server
+   */
+  SyncCompletedWithAllItemsUploaded = 'SyncCompletedWithAllItemsUploaded',
+  SyncCompletedWithAllItemsUploadedAndDownloaded = 'SyncCompletedWithAllItemsUploadedAndDownloaded',
+  SingleRoundTripSyncCompleted = 'SingleRoundTripSyncCompleted',
+  SyncWillBegin = 'sync:will-begin',
+  DownloadFirstSyncCompleted = 'sync:download-first-completed',
+  SyncTakingTooLong = 'sync:taking-too-long',
+  SyncError = 'sync:error',
+  InvalidSession = 'sync:invalid-session',
+  MajorDataChange = 'major-data-change',
+  LocalDataIncrementalLoad = 'local-data-incremental-load',
+  LocalDataLoaded = 'local-data-loaded',
+  EnterOutOfSync = 'enter-out-of-sync',
+  ExitOutOfSync = 'exit-out-of-sync',
+  StatusChanged = 'status-changed',
+  DatabaseWriteError = 'database-write-error',
+  DatabaseReadError = 'database-read-error',
+  SyncRequestsIntegrityCheck = 'sync:requests-integrity-check',
+}

packages/services/src/Domain/Event/SyncEventReceiver.ts

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+import { SyncEvent } from './SyncEvent'
+
+export type SyncEventReceiver = (event: SyncEvent) => void