Enable selecting month/year in the event calendar view date picker

[OmeGak]

Is your feature request related to a problem?

The event calendar view permanently displays a date picker on the sidebar. This date picker, however, is configured so that it can only be navigated month by month. This makes it cumbersome when a user wants to see events that took place far in the past or scheduled far into the future.

Describe the solution you'd like

Configure the date picker so that it's possible to navigate by selecting month and year.

Describe alternatives you've considered

Not necessarily alternatives, but these are things I have considered related to the date picker in this view:

• Removing the date picker altogether as it adds very little and takes significant real estate in the view. Instead, it could be displayed when clicking on a "Go to date..." button.
• Allowing the user to pick any day on a given month, rather than only the first one. As it is right now, it's not entirely obvious that only the first day of the month is selectable.
• Updating the displayed month in the date picker when navigating the calendar component itself. As it is right now, navigating the calendar doesn't update the date picker.
• Rather than improving all these issues in the current jQuery date picker, update it with the React one.

Additional context

This feature request comes inspired by Perimeter Institute's in-house developed calendar view: