Refactor calendar to use new sync statuses and stages (#6141)

- Refactor calendar modules and some messaging modules to better
organize them by business rules and decouple them
- Work toward a common architecture for the different calendar providers
by introducing interfaces for the drivers
- Modify cron job to use the new sync statuses and stages

packages/twenty-server/src/engine/integrations/cache-storage/types/cache-storage-namespace.enum.ts

@@ -1,4 +1,5 @@
 export enum CacheStorageNamespace {
   Messaging = 'messaging',
+  Calendar = 'calendar',
   WorkspaceSchema = 'workspaceSchema',
 }