5622 add a syncemail onboarding step (#5689)

- add sync email onboarding step
- refactor calendar and email visibility enums
- add a new table `keyValuePair` in `core` schema
- add a new resolved boolean field `skipSyncEmail` in current user




https://github.com/twentyhq/twenty/assets/29927851/de791475-5bfe-47f9-8e90-76c349fba56f

packages/twenty-server/src/engine/workspace-datasource/workspace-datasource.service.ts

@@ -29,6 +29,15 @@ export class WorkspaceDataSourceService {
     return dataSource;
   }
 
+  public async checkSchemaExists(workspaceId: string) {
+    const dataSource =
+      await this.dataSourceService.getDataSourcesMetadataFromWorkspaceId(
+        workspaceId,
+      );
+
+    return dataSource.length > 0;
+  }
+
   public async connectedToWorkspaceDataSourceAndReturnMetadata(
     workspaceId: string,
   ): Promise<{ dataSource: DataSource; dataSourceMetadata: DataSourceEntity }> {