Introduce a new feature flag for contact creation (#5570)

Introduce new feature flag
`IS_CONTACT_CREATION_FOR_SENT_AND_RECEIVED_EMAILS_ENABLED` to allow
contacts to be created for sent and received emails.

packages/twenty-server/src/database/typeorm-seeds/core/feature-flags.ts

@@ -50,6 +50,11 @@ export const seedFeatureFlags = async (
         workspaceId: workspaceId,
         value: true,
       },
+      {
+        key: FeatureFlagKeys.IsContactCreationForSentAndReceivedEmailsEnabled,
+        workspaceId: workspaceId,
+        value: true,
+      },
     ])
     .execute();
 };