Update the event model with new calendar event attributes

[ahmedxgouda]

Describe the solution you'd like
We need to update the event model, so we can use it for calendar events. To distinguish between real and calendar event, we will add type field.

Are you going to work on implementing this?

• Yes
• No

Additional context
https://developers.google.com/workspace/calendar/api/v3/reference/events#resource-representations