Added mail_calendar and general_setting response fields for Groups API endpoints. And new general_setting response fields for Users API endpoints.

Added response fields for Groups and Users APIs


## Added
- New `mail_calendar`, `general_setting` response fields in the following  **Groups** APIs:
	- `GET /v2/groups/{groupId}/settings`
	- `GET /v2/accounts/{accountId}/groups/{groupId}/settings`
- New `general_setting` response field in the following  **Users** APIs:
	- `GET /v2/accounts/{accountId}/users/{userId}/settings`
	- `GET /v2/users/{userId}/settings`
