Add day, week and year view mode

## Prerequisites
- [ ] I have searched open and closed issues for duplicates.

## Feature
The Calendar is such a good application and I understand the minimalist philosophy behind it but when we use it there's no options for different views such as: day, week or year. If I have a lot of events in a day, for example, I only can see them in a month view, so I can't access my daily schedule. Once again, I understand the minimalist philosophy behind it, but I think to add this feature could help users in their daily tasks. And furthermore, I know we have already the column on the right side that allows a view of my daily schedule and my week, but I think it isn't enough for some users in terms of productivity and accessibility. It'd be nicer on a entire new view mode like Gnome Calendar does.


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