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/modules/connected-account/utils/is-throttled.ts

@@ -0,0 +1,25 @@
+import { MESSAGING_THROTTLE_DURATION } from 'src/modules/messaging/common/constants/messaging-throttle-duration';
+
+export const isThrottled = (
+  syncStageStartedAt: string | null,
+  throttleFailureCount: number,
+): boolean => {
+  if (!syncStageStartedAt) {
+    return false;
+  }
+
+  return (
+    computeThrottlePauseUntil(syncStageStartedAt, throttleFailureCount) >
+    new Date()
+  );
+};
+
+const computeThrottlePauseUntil = (
+  syncStageStartedAt: string,
+  throttleFailureCount: number,
+): Date => {
+  return new Date(
+    new Date(syncStageStartedAt).getTime() +
+      MESSAGING_THROTTLE_DURATION * Math.pow(2, throttleFailureCount - 1),
+  );
+};