o365 calendar sync (#8044)

Implemented:

* Account Connect
* Calendar sync via delta ids then requesting single events


I think I would split the messaging part into a second pr - that's a
step more complex then the calendar :)

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Co-authored-by: bosiraphael <raphael.bosi@gmail.com>

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -14,5 +14,6 @@ export enum FeatureFlagKey {
   IsGmailSendEmailScopeEnabled = 'IS_GMAIL_SEND_EMAIL_SCOPE_ENABLED',
   IsAnalyticsV2Enabled = 'IS_ANALYTICS_V2_ENABLED',
   IsUniqueIndexesEnabled = 'IS_UNIQUE_INDEXES_ENABLED',
+  IsMicrosoftSyncEnabled = 'IS_MICROSOFT_SYNC_ENABLED',
   IsAdvancedFiltersEnabled = 'IS_ADVANCED_FILTERS_ENABLED',
 }